Exhibit A-1

EX-10.1 3 dex101.htm COLLABORATION AND LICENSE AGREEMENT Prepared by R.R. Donnelley Financial -- COLLABORATION AND LICENSE AGREEMENT
 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED. Exhibit 10.1 COLLABORATION AND LICENSE AGREEMENT between KIRIN BREWERY CO., LTD., (on the one hand) and MEDAREX, INC. and GENPHARM INTERNATIONAL, INC. (on the other hand) Effective as of September 4, 2002 


 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS ............................................................... 2 ARTICLE II ANTIGEN AND ANTIBODY LISTS AND RELATED LISTING PROCEDURES AND DISCLOSURE REQUIREMENTS .................................... 33 2.1 Antibody Sequence List and Antigen Lists Maintained by Each Party ...... 33 2.2 In-House Target Lists and Medarex Internal Project List ................ 33 2.3 Listing Procedures ..................................................... 33 2.4 Disclosure of Certain Antigen Lists .................................... 41 2.5 Confidentiality of Antigen and Antibody Disclosures .................... 41 2.6 Records Retention; [*] ................................................. 41 ARTICLE III ANTIBODY AND ANTIGEN AVAILABILITY ......................................... 42 3.1 Principles of Antibody and Antigen Availability ........................ 42 3.2 Medarex Antigen Inquiries .............................................. 43 3.3 Kirin Antigen Inquiries ................................................ 44 3.4 Medarex Antibody Inquiries ............................................. 48 3.5 Kirin Antibody Inquiries ............................................... 49 3.6 Notices, Inquiries and Other Requests Relating to Antibodies and Antigens ............................................................... 51 3.7 Covenants Relating to Lists and Disclosures ............................ 52 3.8 Purchase of Rights ..................................................... 52 ARTICLE IV ANTIGEN AND ANTIBODY SELECTION FOR EXERCISE OF LICENSE RIGHTS ............................................................ 52 4.1 Projects Involving Use of Medarex Mice and/or Medarex Technology ....... 52 4.2 Reservation Licenses ................................................... 53 4.3 Commercial Licenses .................................................... 54 4.4 [*] .................................................................... 62 ARTICLE V IN-HOUSE PROJECTS ......................................................... 64 5.1 In-House Target List ................................................... 64 5.2 [*] Target Selection ................................................... 67 5.3 [*] Target Selection ................................................... 68 5.4 Abandoned Target Selection ............................................. 69 5.5 Removing Targets from the [*] and the Target List ...................... 69 ARTICLE VI PARTNER PROJECTS .......................................................... 69 [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -i-


 TABLE OF CONTENTS (continued) Page 6.1 Partner Projects ...................................................... 69 6.2 Partner Projects Involving Special Relationships ...................... 70 6.3 [*] Advertisements or Other Promotions ................................ 70 6.4 Partner Opportunities ................................................. 71 6.5 Covenants ............................................................. 71 6.6 Offers of Collaboration Mice to Partners .............................. 73 ARTICLE VII CHANGE IN STATUS OF IN-HOUSE PROJECT OR PARTNER PROJECT .................. 74 7.1 Change in Rights Related to Target Designated for In-House Project .... 74 7.2 Change in Rights Related to Target Selected for Partner Project ....... 74 ARTICLE VIII GRANTS OF LICENSES ....................................................... 75 8.1 Present Grants of Licenses ............................................ 75 8.2 Medarex Licenses to Kirin ............................................. 75 8.3 Kirin Licenses to Medarex ............................................. 81 8.4 Negotiations Regarding Licenses Outside the Field ..................... 85 8.5 Sublicenses ........................................................... 85 8.6 Covenants Relating to Licenses and Sublicenses ........................ 91 8.7 Termination of Commercial License ..................................... 97 8.8 License Grants and Exercise Prior to the Effective Date ............... 97 8.9 Condition Precedent to Grant of a Commercial License .................. 99 8.10 Registration of Patent Licenses ....................................... 99 8.11 [*] and Rights Preserving Excuse ...................................... 99 8.12 No Other Rights ....................................................... 103 ARTICLE IX TRANSFER OF MATERIALS .................................................... 103 9.1 Transfer of Mice and Mice Materials ................................... 103 9.2 Information Disclosure ................................................ 105 9.3 Production Process Technology ......................................... 105 ARTICLE X LICENSE FEES, MILESTONES, ROYALTIES AND OTHER PAYMENTS ................... 105 10.1 Initial License Fees and Other Consideration .......................... 105 10.2 Reservation License Fees .............................................. 106 10.3 Commercial License Fees ............................................... 108 [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -ii-


 TABLE OF CONTENTS (continued) Page 10.4 Antigen Exclusivity Fees ......................................................... 109 10.5 [*] Target Milestone Payments .................................................... 111 10.6 In-House Project Royalties ....................................................... 117 10.7 Partner Royalties and Partner Payments ........................................... 118 10.8 Equity Investments by a Party in Connection with Partner Projects ................ 123 10.9 In-House Project Royalty, Partner Royalty and Partner Payment Terms .............. 125 10.10 Partner Payments and Royalty Payments Periods .................................... 126 10.11 Statements ....................................................................... 127 10.12 Records Retention; Audit ......................................................... 127 10.13 Mode of Payment and Withholding and Similar Taxes ................................ 128 10.14 Payments in Other Currencies ..................................................... 128 ARTICLE XI RESEARCH AND COLLABORATION RELATING TO JOINT TECHNOLOGY ............................... 129 11.1 Research and Research Reports .................................................... 129 11.2 Collaboration Meetings for Development of Medarex, Kirin and Joint Technologies .. 129 ARTICLE XII INTELLECTUAL PROPERTY RIGHTS .......................................................... 129 12.1 Intellectual Property Ownership .................................................. 129 12.2 Prosecution of Patents and Trademarks ............................................ 131 12.3 Enforcement of Patents ........................................................... 135 12.4 Infringement of Third Party Rights ............................................... 137 ARTICLE XIII CONFIDENTIALITY ....................................................................... 140 13.1 Disclosure and Use Restrictions .................................................. 140 13.2 Authorized Disclosure ............................................................ 140 13.3 Use of Name ...................................................................... 141 13.4 Press Releases and Filings with the SEC .......................................... 141 13.5 Equitable Relief ................................................................. 142 13.6 Third Party Agreements ........................................................... 142 ARTICLE XIV TERM AND TERMINATION .................................................................. 142 14.1 Term ............................................................................. 142 14.2 Termination of this Agreement for Material Breach ................................ 142 14.3 Consequences of Expiration or Termination ........................................ 143 [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchan ge Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -iii- 


 TABLE OF CONTENTS (continued) Page 14.4 Cure in Certain Instances ........................................................ 143 14.5 Rights in Bankruptcy ............................................................. 144 14.6 Accrued Rights; Surviving Obligations ............................................ 145 14.7 Notices Relating to Project Agreements for Kirin Partner Projects and Kirin In-House Projects .......................................................... 146 ARTICLE XV INDEMNITY ............................................................................. 146 15.1 Indemnification of Medarex ....................................................... 146 15.2 Indemnification of Kirin ......................................................... 146 15.3 Indemnification Procedure ........................................................ 147 15.4 Insurance ........................................................................ 149 ARTICLE XVI REPRESENTATIONS AND WARRANTIES ........................................................ 149 16.1 Representations, Warranties and Covenants ........................................ 149 16.2 Additional Representations, Warranties and Covenants of Medarex .................. 150 16.3 Additional Representations, Warranties and Covenants of Kirin .................... 151 16.4 Knowledge; Officers .............................................................. 152 16.5 Limitation of Warranty ........................................................... 152 ARTICLE XVII DISPUTE RESOLUTION .................................................................... 152 17.1 General .......................................................................... 152 17.2 Interim Relief ................................................................... 153 17.3 Language ......................................................................... 153 17.4 Covenant Relating to "WHEREAS" Clauses ........................................... 153 ARTICLE XVIII MISCELLANEOUS ......................................................................... 153 18.1 Force Majeure .................................................................... 153 18.2 Governing Law .................................................................... 154 18.3 Notices .......................................................................... 154 18.4 Assignment ....................................................................... 156 18.5 Entire Agreement; Modifications .................................................. 157 18.6 Severability ..................................................................... 157 18.7 Waiver ........................................................................... 157 18.8 Independent Contractors .......................................................... 157 18.9 Language ......................................................................... 157 [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchan ge Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -iv-


 TABLE OF CONTENTS (continued) Page 18.10 Descriptive Headings ............................................ 158 18.11 Counterparts .................................................... 158 18.12 No Third Party Rights ........................................... 158 18.13 Further Assurances .............................................. 158 18.14 Cumulative Remedies ............................................. 158 18.15 Attorneys' Fees ................................................. 158 [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -v- 


 COLLABORATION AND LICENSE AGREEMENT THIS COLLABORATION AND LICENSE AGREEMENT ("Agreement"), is made and entered into as of September 4, 2002, by and between KIRIN BREWERY CO., LTD., having principal offices at 10-1 Shinkawa 2-chome, Chuo-ku, Tokyo 104-8288, Japan ("Kirin") and MEDAREX, INC., having principal offices at 707 State Road, Suite 206, Princeton, New Jersey ###-###-####, United States of America, and a wholly owned subsidiary, GENPHARM INTERNATIONAL, INC., with principal offices at 521 Cottonwood Drive, Milpitas, California 95035, United States of America (collectively, "Medarex"). Kirin and Medarex each may be referred to herein individually as a "Party," or collectively as the "Parties." WHEREAS, Kirin, Medarex, and their respective Affiliates have developed, and continue to refine and further develop, technologies in the area of monoclonal antibody production utilizing mice carrying human immunoglobulin loci; WHEREAS, Medarex owns or otherwise has the right to license patent and other intellectual property rights in and to a proprietary system for obtaining high affinity monoclonal antibodies derived from mice carrying a portion of the human immunoglobulin loci, a key component of which system is a transgenic mouse referred to as the HuMAb Mouse(R) (as defined below); WHEREAS, Kirin owns or otherwise has the right to license patent and other intellectual property rights in and to a proprietary system for obtaining high affinity monoclonal antibodies derived from mice carrying human immunoglobulin loci, key components of which system are transchromosomic mice referred to as the TC Mouse(TM) (as defined below) and the HAC Mouse(TM) (as defined below); WHEREAS, Medarex and Kirin have collaborated to develop, and continue to refine and further develop, a new proprietary system for obtaining high affinity monoclonal antibodies derived from mice carrying a portion of the human immunoglobulin loci, a key component of which system is a mouse referred to as the KM-Mouse(TM) (as defined below); WHEREAS, in the absence of the license grants contained in this Agreement, Medarex believes that use or exploitation by Kirin of the TC Mouse(TM), HAC Mouse(TM), HuMAb Mouse(R), or KM-Mouse(TM) and related information and technology would infringe certain patent or other intellectual property rights of Medarex, and Kirin believes that use or exploitation by Medarex of the TC Mouse(TM), HAC Mouse(TM), or KM-Mouse(TM) and related information and technology would infringe certain patent or other intellectual property rights of Kirin; WHEREAS, while neither Kirin nor Medarex concedes that its use of such technology would infringe any intellectual property rights of the other Party, or concedes that there is any basis for any infringement claims by the other Party, each Party nonetheless desires to avoid protracted and burdensome litigation, and to secure licenses to any potential blocking patents of the other Party that might prevent or hinder such Party from practicing and further developing such technology, by entering this Agreement and granting each other license rights to use and exploit the TC Mouse(TM), HAC Mouse(TM), HuMAb Mouse(R), and KM-Mouse(TM) and related information and technology; WHEREAS, subject to the terms and conditions of this Agreement, Medarex and Kirin each desires the ability to grant to affiliates and/or third parties licenses (and sublicenses) to exploit transgenic and/or transchromosomic mice carrying at least a portion of the human immunoglobulin loci, specifically the TC Mouse(TM), HAC Mouse(TM), HuMAb Mouse(R), KM-Mouse(TM) and related information and technology, including rights to resulting products, so as to allow affiliates and/or third parties to engage in research, development, manufacture, and commercialization of such resulting products; [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. 


 WHEREAS, affording each Party and its licensees access to and rights in technology relating to the TC Mouse(TM), HAC Mouse(TM), HuMAb Mouse(R), and KM-Mouse(TM) is likely to result in research and development synergies leading to more rapid development and commercialization of marketable products; WHEREAS, subject to the terms and conditions of this Agreement, Medarex and Kirin each desires to grant to the other Party licenses to practice transgenic and/or transchromosomic mouse technology, as the case may be, including that technology related to the HuMAb Mouse(R), TC Mouse(TM), HAC Mouse(TM), and KM-Mouse(TM) to generate antibodies derived from human immunoglobulin loci carried by such mice in order to develop and commercialize antibody products raised against and with affinity for antigens selected by Medarex, Kirin, or their respective sublicensees; WHEREAS, the Parties acknowledge and agree, in the spirit of equal partnership, that they intend to provide each Party with access to the other Party's Technology (as defined below) in a manner which encourages commercial use by both Parties, consistent with the terms and conditions of this Agreement; and WHEREAS, Medarex and Kirin entered into that certain agreement entitled "Agreement on Essential Terms for Collaboration," effective as of December 27, 1999, concerning the terms that form the basis of this Agreement, and the Parties now desire to supersede such agreement with this Agreement. NOW, THEREFORE, in accordance with the foregoing and for other valuable consideration, the receipt and adequacy of which are hereby acknowledged, Kirin and Medarex hereby agree as follows: ARTICLE I DEFINITIONS The following capitalized terms used herein shall have the respective meanings set forth below: 1.1 "1st Approval" shall mean, with respect to any Collaboration Product, the first Marketing Approval obtained in any of the United States, a Major European Country, or Japan. 1.2 "2nd Approval" shall mean, with respect to any Collaboration Product as to which the 1st Approval has been obtained in any of the United States, a Major European Country, or Japan, the immediately succeeding Marketing Approval obtained with respect to such product in any of such territories in which the 1st Approval was not obtained. For the avoidance of doubt, in the event the 1st Approval with respect to the Collaboration Product has been obtained in a Major European Country for purposes of Section 1.1 hereof, in order for any succeeding Marketing Approval with respect to such product to constitute the 2nd Approval for purposes of this Section 1.2, such succeeding Marketing Approval must be obtained in either the United States or Japan. 1.3 "3rd Approval" shall mean, with respect to any Collaboration Product for which the 1st Approval and 2nd Approval have been obtained in any of the United States, a Major European Country, or Japan, the immediately succeeding Marketing Approval obtained with respect to such product in any of such territories in which neither the 1st Approval nor the 2nd Approval was obtained. For the avoidance of doubt, in the event that either the 1st Approval or 2nd Approval with respect to the Collaboration Product has been obtained in a Major European Country for purposes of Section 1.1 or Section 1.2 hereof, as applicable, in order for any succeeding Marketing Approval with respect to such product to constitute the 3rd Approval for purposes of this Section 1.3, such succeeding Marketing Approval must be obtained [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -2-


 in either the United States or Japan, depending on in which of such territories such product has not obtained either the 1st Approval or the 2nd Approval. 1.4 "[*]" shall mean any Target [*] a Party from its In-House Target List pursuant to Section 5.4 hereof. 1.5 "Acting Party" shall mean the Party other than the Responsible Party, which acts to abate any Third Party infringement that relates to the KM Patent Rights or KM Trademarks in accordance with Section 12.3.1(b) hereof in the event that the Responsible Party elects not to act to abate such infringement. 1.6 "Additional Antibody Inquiry Response Period" shall have the meaning set forth in Section 3.5.2(a) hereof. 1.7 "Additional Antigen Inquiry Response Period" shall have the meaning set forth in Section 3.3.1(d)(i) hereof. 1.8 "Affiliate" shall mean with respect to any Person, another Person that, directly or indirectly, through one or more intermediaries, controls, is controlled by, or is under common control with such first Person. For purposes of this definition only, "control" and, with correlative meanings, the terms "controlled by" and "under common control with," shall mean (a) the possession, directly or indirectly, of the power to direct the management or policies of a Person, whether through the ownership of voting securities or by contract relating to voting rights or corporate governance; or (b) the ownership, directly or indirectly, of at least fifty percent (50%) of the voting securities or other ownership interest of a Person; provided that, if local law requires a minimum percentage of local ownership of voting securities or other ownership interest, control will be established by direct or indirect actual or beneficial ownership of the majority of the maximum ownership percentage that may, under such local law, be owned by foreign interests; provided further that, except as otherwise expressly provided in Sections 8.5.3(a) and 8.6.4 hereof, a Person which is a Former Affiliate shall be deemed to be an Affiliate throughout the Term of this Agreement with respect to any rights granted to or exercised by such Person pursuant to a Former Affiliate Agreement. Notwithstanding the foregoing, any agreement entered into by [*] prior to the Effective Date (whether or not amended after the Effective Date but solely to the extent any such amendment does not result in [*] shall be deemed not to be an agreement between [*] and an "Affiliate" (or a "Former Affiliate" (as defined below)) for purposes of this Agreement. With respect to [*], the Parties acknowledge and agree that, as of the Effective Date, the facts and circumstances surrounding [*] to satisfy the definition of an "Affiliate" or a "Former Affiliate" provided in this Section 1.8; provided, however, that should [*] satisfy the definition of an "Affiliate" provided in this Section 1.8 at any time after the Effective Date, it shall be deemed an "Affiliate" for purposes of this Agreement (subject to the preceding sentence). 1.9 "Agreement on Essential Terms for Collaboration" shall mean the Agreement on Essential Terms for Collaboration entered into by and between Medarex and Kirin effective as of December 27, 1999, as amended. 1.10 "Antibody" shall mean any human sequence monoclonal antibody, or any fragment thereof or antibody fusion protein produced therefrom, with a unique amino acid sequence that has a useful binding affinity for the Antigen against which it was raised. For the purposes of this Agreement, each Antibody shall be identified by reference to the Antibody Amino Acid Sequence, and Antibodies with different Antibody Amino Acid Sequences (even if differing by only a single amino acid) shall be deemed to be different Antibodies, irrespective of whether they have affinity for the same Antigen. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -3-


 1.11 "Antibody Amino Acid Sequence" shall mean, with respect to any Antibody, the amino acid sequence [*]. 1.12 "Antibody Availability Inquiry" shall mean a written inquiry provided by Kirin to Medarex to ascertain the availability of an Antibody on behalf of Kirin, any of its Affiliates, Partners or In-House Collaborators and which describes the Antibody Amino Acid Sequence for the Antibody and the Antigen against which the Antibody was raised, and for which the Antibody has affinity (which Antigen description shall include the information that Kirin would be required to provide to Medarex in accordance with this Agreement in the context of an Antigen Availability Inquiry). 1.13 "Antibody Material" shall mean, (a) with respect to any Antibody, the nucleic acids (including DNA, RNA, and complementary and reverse complementary nucleic acids thereto, whether coding or noncoding and whether intact or a fragment) in each case that code for such Antibody and do not code for multiple Antibodies, or (b) a host cell (other than a host cell obtained directly from Collaboration Mice or parts of such mice) into which the nucleic acids described in (a) are introduced. 1.14 "[*]" shall mean, with respect to each Commercial License under which a Party has the right pursuant to the terms and conditions of Article IV hereof to exercise rights with respect to a particular Commercial Target, [*] as the case may be, with respect to such Commercial License. 1.15 "Antibody Product" shall mean any composition or formulation containing one or more Antibodies. 1.16 "Antibody Sequence List" shall mean a list identifying each (a) Antibody that Medarex has selected, prior to the Effective Date, or selects on or after the Effective Date, as the subject of a HuMAb Project (and with respect to which Medarex desires to reserve rights for the exercise thereof by Medarex or the grant of a license by Medarex to a Medarex Affiliate or a Third Party); and (b) Selected Antibody; provided, however, that with respect to any Antibody (including any Selected Antibody) with respect to which Medarex has granted a license or other rights pursuant to an agreement entered into with a Third Party prior to the Effective Date, the list shall identify only those Antibodies (or Selected Antibodies, as the case may be) that have been or are disclosed to Medarex in writing by such Third Party. For the avoidance of doubt, with respect to Antibodies selected after the Effective Date, the Antibody Sequence List will contain such items which are added in accordance with Section 2.3.2(b)(iii) hereof. 1.17 "Antigen" shall mean any protein (including any glyco- or lipo-protein or any other modified protein), peptide, carbohydrate, compound or other composition, and any fragment or epitope of any of the foregoing, that stimulates the production of Antibodies. 1.18 "Antigen Availability Inquiry" shall mean a written inquiry provided by Kirin to Medarex to ascertain the availability of an Antigen on behalf of Kirin, any of its Affiliates, Partners or In-House Collaborators, which describes such Antigen by indicating all of the following information to the extent that such information is [*] with respect to such Antigen at the time of such inquiry: [*], other [*], the [*], equivalent [*] from other [*], and the [*] and/or the [*] therefor; provided, however, that if there is no [*] or equivalent [*] from other [*] with respect to such Antigen, Kirin shall describe such Antigen by indicating, at a minimum, the [*] and/or [*] therefor. 1.19 "Antigen Evaluation Materials" shall mean, with respect to an Antigen: (a) a written description of the Antigen, including [*]; (b) the [*] and/or [*] for such Antigen; (c) data reasonably necessary for determining whether such Antigen [*]; (d) [*] data in the possession of the Designating [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -4-


 Party and/or its Affiliates relating to such Antigen; (e) information regarding the [*] of such Antigen, the intellectual property rights Controlled by the Designating Party and/or its Affiliates with respect to such Antigen, and any [*] that would limit or otherwise affect the Parties' [*] any Collaboration Products with respect thereto; (f) existing and available [*] for [*]; (g) a list of [*] for Antibody Products against such Antigen; (h) [*] applicable to Antibody Products against such Antigen; (i) [*] undertaken by or on behalf of the Designating Party or its Affiliates (or its In-House Collaborator) with respect to the [*] of [*] against such Antigen; (j) the [*] such Antigen is a [*] for the development of Antibody Products; (k) [*] and the [*] regarding the Antigen; and (l) other [*] in the Designating Party's or its Affiliates' possession with respect to such Antigen. 1.20 "Antigen Exclusive Commercial License" shall mean a Medarex Antigen Exclusive Commercial License or a Kirin Antigen Exclusive Commercial License, as the case may be. 1.21 "Antigen Exclusivity Fee" shall mean the amount, if any, payable by a Party to the other Party pursuant to Section 10.4.1, 10.4.2 or 10.4.3 hereof, as applicable. 1.22 "Antigen Lists" shall mean any one or more of the Medarex Restricted Antigen List, Shared Exclusive Antigen List, Medarex Non-Exclusive Antigen List, and the Kirin Non-Exclusive Antigen List. 1.23 "Antigen Non-Exclusive Commercial License" shall mean a Medarex Antigen Non-Exclusive Commercial License or a Kirin Antigen Non-Exclusive Commercial License, as the case may be. 1.24 "Antigen Semi-Exclusive Commercial License" shall mean a Medarex Antigen Semi-Exclusive Commercial License or a Kirin Antigen Semi-Exclusive Commercial License, as the case may be. 1.25 "Asia" shall mean the dark shaded territory on the map attached as Exhibit A. 1.26 "Bankruptcy Code" shall mean the Title 11 of the United States Code. 1.27 "Breeding License" shall mean the Medarex Breeding License or the Kirin Breeding License, as the case may be. 1.28 "Calendar Quarter" shall mean each period of three consecutive calendar months ending on March 31, June 30, September 30, and December 31. 1.29 "Calendar Year" shall mean each successive period of twelve months commencing on January 1 and ending on December 31. 1.30 "Coding System" shall mean the system to be implemented by Medarex pursuant to Section 2.3.1(c) hereof whereby Medarex assigns a unique code to each Antigen and each Antibody, as the case may be, when placing the Antigen on an Antigen List or the Antibody on the Antibody Sequence List, as applicable, pursuant to Section 2.3.2 hereof. 1.31 "Collaboration Antibody" shall mean an Antibody that, during the period beginning on December 27, 1999, and ending on the last day of the Term, has been originally obtained, isolated, identified, or derived from one or more of the Collaboration Mice, whether or not subsequently refined or produced through the use of nucleic acids or cells obtained, isolated, identified, or derived from one or more of the Collaboration Mice; provided, however, that no Antibody originally obtained, isolated, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -5-


 identified, or derived from a Medarex Mouse, or through the use of nucleic acids or cells obtained, isolated, identified, or derived from a Medarex Mouse, by or on behalf of Medarex, a Medarex Affiliate, a Medarex Partner, an In-House Collaborator or other Third Party to which Medarex has granted rights with respect to Medarex Mice, shall be deemed to be a Collaboration Antibody. 1.32 "Collaboration Mouse" shall mean a Kirin Mouse, Medarex Mouse, or KM-Mouse(TM), and "Collaboration Mice" shall mean more than one Collaboration Mouse. 1.33 "Collaboration Product" shall mean any Antibody Product containing one or more Collaboration Antibodies. 1.34 "Commercialization Rights" shall mean, with respect to any Collaboration Antibody or Collaboration Product comprising such Antibody (or Antibody Material related thereto), the rights to sell, lease, offer to sell or lease, or otherwise transfer title to such Collaboration Antibody or Collaboration Product. 1.35 "Commercial License" shall mean an Antigen Exclusive Commercial License, an Antigen Semi-Exclusive Commercial License, or an Antigen Non-Exclusive Commercial License, as the case may be. 1.36 "Commercial License Fee" shall mean the amount, if any, payable, by a Party to the other Party pursuant to Section 10.3.1(a) or 10.3.1(b) hereof, as applicable. 1.37 "Commercial Target" shall mean an Exclusive Commercial Target, a Semi-Exclusive Commercial Target, or a Non-Exclusive Commercial Target, as the case may be. 1.38 "Confidential Information" of a Party shall mean any and all information and any tangible embodiments thereof in any medium provided by or on behalf of such Party to the other Party, either in connection with the discussions and negotiations pertaining to the Agreement on Essential Terms for Collaboration or this Agreement or in the course of performing the Agreement on Essential Terms for Collaboration or this Agreement, including, without limitation, data, knowledge, practices, processes, ideas, research plans, engineering drawings, research data, techniques, scientific, marketing and business plans, and financial and personnel matters relating to the disclosing Party or to its present or future products, sales, suppliers, customers, employees, investors, or business. Notwithstanding any of the foregoing, information shall not be deemed Confidential Information if it: (a) was already known, discovered or developed by the receiving Party or its Affiliates, other than under an obligation of confidentiality or non-use owed by the receiving Party to the disclosing Party, prior to the time of disclosure to the receiving Party; (b) was generally available or known, or was otherwise part of the public domain, prior to its disclosure to the receiving Party; (c) became generally available or known, or otherwise became part of the public domain, after its disclosure to the receiving Party through no fault of the receiving Party; (d) was disclosed to the receiving Party or its Affiliates, other than under an obligation of confidentiality or non-use, by a Third Party who had no obligation of non-disclosure or non-use to the disclosing Party; or [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -6-


 (e) was independently discovered or developed by such receiving Party or its Affiliates, as evidenced by their written records, without access to the Confidential Information of the disclosing Party. 1.39 "Contracting Party" shall mean the Party (or the Affiliate of which, as permitted under Section 8.5.3 hereof) that enters or is considering entering into a Project Agreement with respect to a Partner Project pursuant to which such Party (or any of its Affiliates) would receive or actually receives securities from a Partner in connection with such Partner Project in accordance with Section 10.8 hereof. 1.40 "Control" shall mean, with respect to any Information and Inventions, Patent Rights or other intellectual property right, possession of the right, whether directly or indirectly, and whether by ownership, license, contract or otherwise (but not by grants of rights or licenses by Medarex and Kirin to one another under this Agreement), to assign or grant a license, sublicense or other right to or under such Information and Invention, Patent Right or other intellectual property right as provided for herein. 1.41 "Core Third Party Patents" shall mean issued, unexpired Patent Rights Controlled by a Third Party and [*] to [*] or [*] as of [*], that have [*] in a [*] or [*] by a [*], which Patent Rights would [*] by a [*] (or [*]) [*] Mice, [*] Mice (to the extent mice having [*] existed on [*]) and/or [*] (to the extent obtained by [*] having the [*] of such a [*] Mouse with a mouse having the [*] of such a [*] MouseTM, which respective mice existed on [*]), but [*] all (a) [*], (b) Patent Rights specifically directed to [*], and (c) Patent Rights specifically directed to [*]. For purposes of this definition, "breeding" shall include conventional methods of breeding and any and all methods for combining genetic material from two or more different strains of mice into a single mouse and shall not be limited to a single breeding generation. 1.42 "Cross License Agreement" shall mean that certain Cross License Agreement entered into by and between Abgenix, Inc., Cell Genesys, Inc., Japan Tobacco Inc. and Xenotech L.P., on the one hand, and GenPharm International, Inc., on the other hand, effective as of March 26, 1997, as amended from time to time, which amendment(s) is consistent with Section 16.2.2 hereof. 1.43 "Cure" shall have the meaning set forth in Section 8.11.4 hereof. 1.44 "Cure Period" shall mean (a) for purposes of Section 14.2 hereof, the [*] calendar day period, commencing [*], or (b) for purposes of Section 8.11.4 hereof, the [*] business day period, commencing [*] pursuant to Section 8.11.4 hereof, whichever may be applicable in the relevant context, provided that in circumstances governed by Section 8.11.4 hereof, the term "Cure Period" shall [*]. 1.45 "[*]" shall have the meaning set forth in Section 1.1 of the form of [*] Agreement agreed to in writing by the Parties on the date of execution of this Agreement. 1.46 "Designated Exchange Rate" shall mean the Kirin Designated Exchange Rate for purposes of calculating payments from Kirin to Medarex and shall mean the Medarex Designated Exchange Rate for purposes of calculating payments from Medarex to Kirin, in each case in accordance with the terms of this Agreement. 1.47 "Designating Party" shall mean that Party which designates an Antigen as a Target for inclusion on its In-House Target List. 1.48 "Designation Date" shall mean the date on which a Party designates an Antigen as a Target on its In-House Target List pursuant to Section 5.1.3(a), 5.1.3(b), or 5.1.3(d) hereof, as applicable. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -7-


 1.49 "Diagnostic Application" shall mean an application of Antibody Products to distinguish, identify and/or analyze a disease, genotype, sensitivity or any other condition in a human, but excluding any In Vivo Therapeutic Application and/or any Ex Vivo Therapeutic Application. 1.50 "Direct Sublicense Agreement" shall mean an agreement entered into by Medarex and an Affiliate, Partner or In-House Collaborator of Kirin pursuant to Section 8.5.1(d)(ii) of this Agreement, which agreement shall be in the form agreed to in writing by the Parties on the date of execution of this Agreement, except to the extent such form of agreement is modified in each case to indicate the appropriate effective date and the counterparty's name, address, and other relevant identifying information, and to the extent that Annex A attached to a Direct Sublicense Agreement and made a part thereof is modified to include appropriate information, in each case in accordance with the terms of Section 8.5.1(d)(iii) hereof. 1.51 "[*]" shall have the meaning set forth in Section 2.6.3 hereof. 1.52 "[*]" shall have the meaning set forth in Section 2.6.3 hereof. 1.53 "Dispute" shall mean a dispute that arises between the Parties in connection with or relating to this Agreement or the performance or breach of any right or obligation hereunder. 1.54 "Dispute Notice" shall mean a written notice of a Dispute provided by one Party to the other Party pursuant to Section 17.1.1 hereof. 1.55 "DNX Agreement" shall mean that certain license agreement between DNX, Inc. and GenPharm International, Inc., effective as of January 1, 1991, as amended from time to time, which amendment(s) is consistent with Section 16.2.2 hereof. 1.56 "Effective Date" shall mean the date first written in the preamble to this Agreement. 1.57 "Embodiments of Intellectual Property" shall have the meaning set forth in Section 14.5.2 hereof. 1.58 "[*]" shall mean the Third Party that acts as "[*]" under the [*] Agreement entered into by the Parties with such Third Party or, where applicable, a Third Party that acts as "[*]" under a [*] Agreement entered into in accordance with Section 2.3.5(a) hereof. 1.59 "[*]" shall mean the agreement, substantially in the form agreed to in writing by the Parties on the date of execution of this Agreement (which form of agreement may be modified only by mutual written agreement of the Parties), that is initially entered into by the Parties [*], or, where applicable, any subsequent agreement, substantially in the form originally agreed to in writing by the Parties on the date of execution of this Agreement, that is entered into in accordance with Section 2.3.5(a) hereof and/or the terms of the [*] Agreement. 1.60 "Evaluation License" shall mean the Medarex Evaluation License or the Kirin Evaluation License, as the case may be. 1.61 "Excluded Claims" shall mean (a) Production Process Patents; and (b) other claims in Patent Rights to the extent such claims are limited to (i) a single Ig Composition, (ii) a single Antigen, (iii) antibodies, antibody fragments, and/or antibody fusion proteins that have affinity for one or more specified Antigen(s), (iv) hybridomas or cells expressing a single Ig Composition, or (v) methods of Manufacture, development, combination compositions, formulations, analytical methods, or use of Ig [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -8-


 Compositions that have affinity for or encode a protein that has affinity for one or more specified Antigen(s). Notwithstanding the foregoing, the claims in the Patent Rights that were or are licensed to Medarex under the Cross License Agreement shall not be deemed to be "Excluded Claims" to the extent that such claims fall within clause (b)(iii) of the preceding sentence. 1.62 "Excluded Know-How" shall mean (a) Production Process Know-How; and (b) Know-How to the extent such Know-How relates to (i) a single Ig Composition, (ii) a single Antigen, (iii) antibodies, antibody fragments, and/or antibody fusion proteins that have affinity for one or more specified Antigen(s), (iv) hybridomas or cells expressing a single Ig Composition, or (v) methods of Manufacture, development, combination compositions, formulations, analytical methods, or use of Ig Compositions that have affinity for or encode a protein that has affinity for one or more specified Antigen(s). 1.63 "Exclusive Commercial Target" shall mean a Kirin Exclusive Commercial Target or a Medarex Exclusive Commercial Target, as the case may be. 1.64 "Expert" shall mean a disinterested individual who is free of conflicts-of-interest, is not affiliated with either Party or any of either Party's Affiliates, and has the relevant scientific, technical and/or regulatory experience necessary to resolve a Dispute pursuant to Article XVII hereof or a matter relating to Rights Preserving Excuse pursuant to Section 8.11 hereof, as the case may be. 1.65 "Exploit" shall mean to do any one or more of the following: research, develop, make, import, export, use, sell, offer for sale, and otherwise exploit. 1.66 "Exploitation" shall mean doing any one or more of the following: researching, developing, making, importation, exportation, use, selling, offering for sale, and otherwise exploiting. 1.67 "Ex Vivo Therapeutic Application" shall mean the use of Antibody Products that are applied in vitro to cells to alter the biological properties of such cells, which cells are then provided, promoted and/or sold as therapeutic and/or prophylactic agents for use in humans, including the use of Antibody Products to separate cells from one another based on a specific Antigen, but excluding any use for an In Vivo Therapeutic Application. 1.68 "[*] Target" shall mean any In-House Target, which is a Commercial Target but is not a [*] Target. 1.69 "[*] Target Product" shall mean any Collaboration Product containing a Collaboration Antibody(ies) raised against and with affinity for a [*] Target. 1.70 "Field" shall mean any and all (a) In-Vivo Therapeutic Applications and Ex-Vivo Therapeutic Applications; (b) Diagnostic Applications; and (c) uses as a Reagent. 1.71 "First Commercial Sale" shall mean the first sale for use or consumption of a Collaboration Product in a country or, if a Marketing Approval is required in a country, the first sale for use or consumption of a Collaboration Product in such country after Marketing Approval has been obtained in such country. 1.72 "Former Affiliate" shall mean a Person which, with respect to a Party, at one point in time satisfies the definition of an "Affiliate" contained in Section 1.8 hereof, but which Person subsequently ceases to be an "Affiliate" of such Party within the meaning of such definition. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -9-


 1.73 "Former Affiliate Agreement" shall mean an agreement entered into by a Party and a Person at a time when such Person satisfies the definition of an "Affiliate" set forth in Section 1.8 hereof, but which Person subsequent to entering into such agreement becomes a Former Affiliate of such Party. 1.74 "[*] Target" shall mean any In-House Target, which is a Commercial Target, but with respect to which a Party [*] in connection with a Collaboration Product(s) containing a Collaboration Antibody(ies) raised against and with affinity for such Commercial Target. 1.75 "[*] Target Product" shall mean any Collaboration Product containing a Collaboration Antibody(ies) raised against and with affinity for a [*] Target. 1.76 "[*] Target Right" shall have the meaning set forth in Section 5.2.1 hereof. 1.77 "[*] Target Substitution" shall mean a Party's substitution for a [*] Target of any other Target on such Party's [*] Target List, including, without limitation, a Target that has been previously designated by such Party as a [*] Target. 1.78 "[*] Target Substitution Fee" shall mean [*] in the case of substitutions [*] and [*] in the case of substitutions [*]. 1.79 "[*]" shall mean with respect to each Antigen that has been selected by a Party as an Exclusive Commercial Target or a Semi-Exclusive Commercial Target for the exercise of rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, [*] with respect to which the licensee Party (and/or its sublicensee) has a right to exercise such License, which [*] is accomplished in accordance with Section 4.4.2 hereof, where applicable. 1.80 "[*]" shall mean, on a sublicense agreement-by-sublicense agreement basis, the right of a Party to grant to a Third Party a sublicense under an Evaluation License, [*]. 1.81 "HAC MouseTM" shall mean any immunizable transchromosomic mouse developed by or for Kirin and/or Kirin Affiliates, that contains one or more human artificial chromosomes or fragments thereof that include centromere and telomere sequences that provide for replication of such human artificial chromosomes or fragments thereof in mice separate from replication of endogenous mouse chromosomes, and which human artificial chromosome(s) or fragment(s) comprises at least a portion of the unrearranged human immunoglobulin heavy chain locus and at least a portion of an unrearranged human immunoglobulin light chain locus; provided, however, that in no event shall a HuMAb Mouse(R), KM-MouseTM or TC MouseTM be considered an HAC MouseTM for any purpose. 1.82 "Headquartered" shall mean with respect to a Person, the location of such Person's principal offices from which the activities of the Person are controlled and directed, or if such Person is under the control of an Affiliate, the location of the principal offices from which the activities of such Affiliate are controlled and directed. 1.83 "HuMAb Collaboration Project" shall mean a HuMAb Project as to which (a) Medarex (and/or any Medarex Affiliate(s), as permitted under Section 8.5.3 hereof to the extent applicable) has entered into a written collaborative research, development and/or commercialization agreement with one or more Medarex Affiliate(s) or Third Party(ies) with respect to the Exploitation of the Antibody Product(s) resulting from such project in exchange for Medarex (and/or a Medarex Affiliate) receiving Substantial Commercialization Rights thereto; provided, however, that Medarex's and/or a Medarex Affiliate's use of subcontractors for research, development, or Manufacturing activities relating to such [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -10-


 project(s) shall not affect the characterization of a project as a "HuMAb Collaboration Project" so long as Medarex and/or such Medarex Affiliate retains Substantial Commercialization Rights with respect to Antibody Product(s) resulting from such project; or (b) Medarex (and/or any Medarex Affiliate(s), as permitted under Section 8.5.3 hereof to the extent applicable) has entered into a material transfer or other technology evaluation agreement with one or more Medarex Affiliate(s) or Third Party(ies) (other than an agreement that grants to such Medarex Affiliate or Third Party(ies) a sublicense under a License granted by Kirin to Medarex in this Agreement) for the purpose of determining whether Medarex (and/or such Medarex Affiliate(s)) and such Medarex Affiliate(s) or Third Party(ies) desire to conduct a project that meets the requirements set forth in clause (a) of this Section. 1.84 "HuMAb License Project" shall mean a HuMAb Project as to which (a) Medarex (and/or a Medarex Affiliate(s), as permitted under Section 8.5.3 hereof to the extent applicable) has entered into a written agreement with one or more Third Party(ies) with respect to such Third Party's(ies') Exploitation of the Collaboration Product(s) resulting from such project whereby neither Medarex nor any Medarex Affiliate retains any Substantial Commercialization Rights with respect to such Collaboration Product(s); or (b) Medarex (and/or a Medarex Affiliate(s), as permitted under Section 8.5.3 hereof to the extent applicable) has entered into a material transfer or other technology evaluation agreement with one or more Third Party(ies) for the purpose of determining whether such Third Party(ies) desires to conduct a project that meets the requirements set forth in clause (a) of this Section; provided, however, that a "HuMAb License Project" shall not include any (i) other project conducted by Medarex (and/or a Medarex Affiliate) with one or more Medarex Affiliates or Third Parties that relates to one or more Antibodies, Antibody Materials and/or Antibody Products initially developed and/or commercialized in connection with a Medarex Internal Project or a HuMAb Collaboration Project even if such project provides to such Medarex Affiliate or Third Party Substantial Commercialization Rights with respect to the Antibody Product(s) resulting from such project and neither Medarex nor any Medarex Affiliate retains Substantial Commercialization Rights with respect to such Antibody Product(s); or (ii) Services Project. 1.85 "HuMAb Mouse(R)" shall mean any immunizable transgenic mouse developed by or for Medarex and/or Medarex Affiliates that contains unrearranged human immunoglobulin transgenes inserted into mouse chromosomes, but excluding any such mouse that contains one or more human chromosomes or fragments thereof that include human immunoglobulin loci and centromere and telomere sequences that provide for replication of such human chromosomes or fragments thereof separate from the replication of the endogenous mouse chromosomes; provided, however that in no event shall a Kirin Mouse or KM-MouseTM be considered a HuMAb Mouse(R) for any purpose. 1.86 "HuMAb Project" shall mean a research, development and/or commercialization project that involves the use of any Medarex Mice, and/or an exercise or grant of rights under any Medarex Technology (and, in Medarex's discretion, the additional use of any Kirin Mice and/or KM-Mice, and/or an exercise or grant of rights under any Kirin Technology and/or KM Patent Rights, in each case only under the Medarex Evaluation License or a sublicense under the Medarex Evaluation License in connection with the same project), to Exploit and/or have Exploited Antibodies originally obtained, isolated, identified or derived from such mice (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) and which project is conducted by Medarex, a Medarex Affiliate, and/or any Third Party with which Medarex has entered into a written agreement with respect to such project; provided, however, that no project that involves the Exploitation of Antibodies (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) raised against and with affinity for an Antigen with respect to which Medarex, in connection with such project, has exercised rights under a Reservation License or a Commercial License (and/or for which Medarex, in connection with such project, has granted to a Third Party a sublicense under a Reservation License or a Commercial [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -11-


 License) shall be deemed a "HuMAb Project". For the avoidance of doubt, the exercise by Medarex of rights under the Medarex Evaluation License in connection with a project, or the grant by Medarex to an Affiliate or Medarex Affiliate and/or Third Party of a sublicense under the Medarex Evaluation License in connection with a project, shall not affect the status of the project as a "HuMAb Project"; provided, however, that upon the exercise by Medarex of rights or the grant by Medarex to an Affiliate or Third Party of a sublicense under a Medarex Reservation License or a Commercial License (other than in connection with a Services Project) granted to Medarex under this Agreement in connection with a project, such project shall convert to a Medarex In-House Project or a Medarex Partner Project, as the case may be. 1.87 "Ig Composition" shall mean an antibody, antibody fragment, or antibody fusion protein characterized by a specific amino acid sequence spanning heavy chain CDR1 through CDR3, or a nucleic acid encoding such antibody, antibody fragment, or antibody fusion protein, wherein different molecules having an identical amino acid sequence (or in the case of nucleic acid molecules, those that code for the identical amino acid sequence) spanning heavy chain CDR1 through CDR3 shall be considered to be the same single Ig Composition. Ig Compositions having different amino acid sequences (or in the case of nucleic acid molecules, those that code for different amino acid sequence) spanning heavy chain CDR1 through CDR3 shall be considered to be different Ig Compositions. 1.88 "Improvement" shall mean any modification to a Collaboration Mouse, related mouse technology, or any discovery, device, or process relating to such Collaboration Mouse or related mouse technology, whether or not patented or patentable, including any enhancement in the efficiency, production or operation of a Collaboration Mouse or related mouse technology, any discovery or development of any new or expanded uses of a Collaboration Mouse or related mouse technology, or any discovery or development that improves the stability, safety, or efficacy of a Collaboration Mouse or related mouse technology, but in any event excluding modifications, enhancements, discoveries, and developments that are covered by or constitute Excluded Claims and/or Excluded Know-How. 1.89 "Indemnification Claim Notice" shall mean a written notice provided by the Indemnified Party to the Indemnifying Party with respect to any Losses or discovery of fact(s) upon which the Indemnified Party intends to base a request for indemnification under Section 15.1 or Section 15.2.1 hereof and which contains a description of the claim and the nature and estimated amount of such Loss (to the extent that the nature and amount of such Loss is known at such time). 1.90 "Indemnified Party" shall mean the Party that requests indemnification under Section 15.1 or Section 15.2.1 hereof. 1.91 "Indemnifying Party" shall mean the Party asked to indemnify the other Party under Section 15.1 or Section 15.2.1 hereof. 1.92 "Information and Inventions" shall mean technical, scientific and other know-how and information, trade secrets, knowledge, technology, means, methods, processes, practices, formulas, instructions, skills, techniques, procedures, experiences, ideas, technical assistance, designs, drawings, assembly procedures, computer programs, apparatuses, specifications, data, results and other material, including pre-clinical and clinical trial results, test procedures and purification and isolation techniques (whether or not confidential, proprietary, patented, or patentable), in written, electronic or any other form now known or hereafter developed, and all improvements thereto, and other discoveries, developments, inventions and other intellectual property (whether or not confidential, proprietary, patented or patentable). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -12- 


 1.93 "In-House Collaborator" shall mean, with respect to any Project Agreement that governs at least one In-House Project, in the case of Medarex, a Third Party or a Medarex Affiliate with which Medarex (and/or a Medarex Affiliate(s)) has entered or enters into such a Project Agreement, and in the case of Kirin, a Third Party or a Kirin Affiliate with which Kirin (and/or a Kirin Affiliate(s)) has entered or enters into such a Project Agreement, in each case, whether prior to, on or after the Effective Date. 1.94 "In-House Project" shall mean a Medarex In-House Project or a Kirin In-House Project, as the case may be. 1.95 "In-House Project Status Change" shall mean a change that a Party makes in accordance with Section 7.1 hereof in the nature of such Party's (and/or its Affiliate's) rights relating to an Antibody(ies) raised against and with affinity for a particular Antigen (and Antibody Materials and Antibody Products relating thereto) in connection with an In-House Project with the result that neither such Party nor any of its Affiliates retains Substantial Commercialization Rights relating to the applicable Antibody Product(s). 1.96 "In-House Project Status Change Date" shall mean the date on which an In-House Project Status Change is implemented by a Party. 1.97 "In-House Target" shall mean an Antigen with respect to which Medarex or Kirin, subject to the terms and conditions of Article IV hereof, exercises its rights under a License in connection with an In-House Project. 1.98 "In-House Target List" shall mean, with respect to each Party, the list that such Party maintains of its In-House Targets in accordance with Section 2.2.1 hereof. 1.99 "Initial Fee" shall mean the Twelve Million Dollars (US $12,000,000) initial fee paid by Kirin to Medarex in accordance with the Agreement on Essential Terms for Collaboration. 1.100 "Invalidity Claim" shall have the meaning set forth in Section 12.4.2(d) hereof. 1.101 "Investigational New Drug Application" or "IND" shall mean an investigational new drug application filed with the United States Food and Drug Administration (and any successor agency thereto) for authorization to commence human clinical trials, or such application's equivalent in countries or regulatory jurisdictions other than the United States. 1.102 "In Vivo Therapeutic Application" shall mean the in vivo use of Antibody Products for human therapeutic and/or prophylactic purposes where such Antibody Products are delivered (by injection or otherwise) into the living human body. 1.103 "Issuer" shall mean a Partner with which a Contracting Party (and/or its Affiliate, as permitted under Section 8.5.3 hereof) intends to enter or actually enters into a Project Agreement governing a Partner Project pursuant to which such Contracting Party (and/or its Affiliate) may receive from such Partner securities in connection with such Partner Project as contemplated by Section 10.8 hereof. 1.104 "Japanese Partner" shall mean a Kirin Partner Headquartered in Japan, which makes payments to Kirin in Japanese Yen. 1.105 "Kirin" shall mean Kirin Brewery Co., Ltd. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -13-


 1.106 "Kirin Affiliate" shall mean an Affiliate of Kirin. 1.107 "Kirin Animal" shall have the meaning set forth in Section 8.2.5 (c) hereof. 1.108 "Kirin Antigen Exclusive Commercial License" shall mean each license granted to Kirin by Medarex in Section 8.2.4(a) hereof. 1.109 "Kirin Antigen Non-Exclusive Commercial License" shall mean each license granted to Kirin by Medarex in Section 8.2.4(b) hereof. 1.110 "Kirin Antigen Semi-Exclusive Commercial License" shall mean each license granted to Kirin by Medarex in Section 8.2.4(c) hereof. 1.111 "Kirin Breeding License" shall mean the license granted to Kirin by Medarex in Section 8.2.1 hereof. 1.112 "Kirin Commercial License" shall mean a Kirin Antigen Exclusive Commercial License, a Kirin Antigen Semi-Exclusive Commercial License, or a Kirin Antigen Non-Exclusive Commercial License, as the case may be. 1.113 "Kirin Commercial Target" shall mean a Kirin Exclusive Commercial Target, a Kirin Semi-Exclusive Commercial Target, or a Kirin Non-Exclusive Commercial Target, as the case may be. 1.114 "Kirin Designated Exchange Rate" shall mean the Telegram Transfer Sell or TTS exchange rate published by the Bank of Tokyo-Mitsubishi Ltd., or, if not so available, as otherwise mutually agreed by the Parties in writing. 1.115 "Kirin Evaluation License" shall mean the license granted to Kirin by Medarex in Section 8.2.2 hereof. 1.116 "Kirin Exclusive Commercial Target" shall mean an Antigen with respect to which Kirin exercises its rights under a Kirin Antigen Exclusive Commercial License pursuant to and in accordance with Section 4.3.2, 4.3.3(d)(i), 4.3.3(e)(i) or 4.3.4 hereof; provided, however, that any such Antigen shall cease to be a Kirin Exclusive Commercial Target upon the expiration or termination of the Kirin Antigen Exclusive Commercial License granted with respect to such Antigen. 1.117 "Kirin Improvement" shall mean any Improvement Controlled by Kirin, but excluding any Improvements for which the Patent Rights or other intellectual property rights are in-licensed by Kirin from a Third Party after the Effective Date. 1.118 "Kirin In-House Project" shall mean a research, development and/or commercialization project that involves the use of Medarex Mice, Kirin Mice, and/or KM-Mice, and/or a grant of rights (including, without limitation, a license or sublicense) under the Medarex Technology, Kirin Technology, and/or KM Patent Rights, to Exploit and/or have Exploited Antibodies originally obtained, isolated, identified or derived from such mice (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) and as to which (a) substantially all of the research or development effort will come from Kirin's (and/or its Affiliate's) internal research or development assets and Kirin (and/or a Kirin Affiliate) retains Substantial Commercialization Rights with respect to the Antibody Product(s) resulting from such project; (b) Kirin (and/or a Kirin Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a written collaborative research, development and/or commercialization agreement with one or more Kirin Affiliate(s) or Third Party(ies) with respect to the Exploitation of the Antibody [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -14- 


 Product(s) resulting from such project in exchange for Kirin (and/or a Kirin Affiliate) receiving Substantial Commercialization Rights thereto; or (c) Kirin (and/or a Kirin Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a material transfer or other technology evaluation agreement with one or more Kirin Affiliate(s) or Third Party(ies) (other than an agreement that grants to such Kirin Affiliate(s) or Third Party(ies) a sublicense under a License granted by Medarex to Kirin pursuant to this Agreement) for the purpose of determining whether Kirin (and/or a Kirin Affiliate(s)) and such Kirin Affiliate(s) or Third Party(ies) desire to conduct a project that meets the requirements set forth in clause (b) of this Section; provided, however, that Kirin's (and/or a Kirin Affiliate(s)'s) use of subcontractors for research, development, or Manufacturing activities relating to such project shall not affect the characterization of a project as a "Kirin In-House Project" so long as Kirin (and/or a Kirin Affiliate) retains Substantial Commercialization Rights with respect to the Antibody Product(s) resulting from such project. 1.119 "Kirin In-License Agreements" shall mean the license agreements, if any, listed on Exhibit D. 1.120 "Kirin Know-How" shall mean all Information and Inventions in the Control of Kirin, during the period of time commencing on December 27, 1999, and ending on the last day of the Term, and which Information and Inventions are necessary for the use of the Kirin Mice, any Antibody derived from Kirin Mice, or any Antibody Product containing such Antibody, and/or the performance of activities covered by the Kirin Patent Rights and are not generally known, but only to the extent conceived, reduced to practice or otherwise developed by one or more employees or agents of Kirin and/or Kirin Affiliates, including, without limitation: (a) biological, chemical, pharmacological, toxicological, pharmaceutical, physical and analytical, clinical, safety and quality control data and information necessary to reproduce, raise or use the Kirin Mice or Antibodies, cells or nucleic acids originally obtained, isolated, identified, or derived from one or more of the Kirin Mice; and (b) assays and methodologies necessary for the use of the Kirin Mice; provided, however, that "Kirin Know-How" excludes any Excluded Know-How, KM Know-How and any Information and Inventions to the extent claimed by the Kirin Patent Rights. 1.121 "Kirin Materials" shall mean the Kirin Mice and/or KM-Mice provided or to be provided by or on behalf of Kirin to Medarex or any Medarex Affiliate pursuant to Section 9.1.1(a) hereof. 1.122 "Kirin Mouse" shall mean any (a) TC Mouse(TM); (b) HAC Mouse(TM); (c) mouse generated by crossbreeding any TC MouseTM with any HAC MouseTM; and (d) Improvement of a TC Mouse(TM), HAC Mouse(TM), or any mouse described in clause (c) of this definition; provided, however, that in no event shall any mouse classified as a Medarex Mouse or KM-Mouse(TM), or an Improvement of a Medarex Mouse or KM-Mouse(TM) be deemed to be a "Kirin Mouse". "Kirin Mice" shall mean more than one Kirin Mouse. 1.123 "Kirin Non-Exclusive Antigen List" shall mean a list identifying each Antigen (other than an Antigen that is a ROFR Target) with respect to which Kirin (a) from time to time during the Term exercises its rights under a Reservation License and/or an Antigen Non-Exclusive Commercial License in accordance with the terms and conditions of Article IV hereof; or (b) prior to the Effective Date, in reliance on the Agreement on Essential Terms for Collaboration, has entered into an agreement that provides for the grant to an Affiliate or Third Party of a license or other rights (including, without limitation, an option or a right of first refusal) in and to the Medarex Mice, Kirin Mice and/or KM-Mice to raise Antibodies against such Antigen on an Antigen non-exclusive basis. 1.124 "Kirin Non-Exclusive Commercial Target" shall mean an Antigen with respect to which Kirin exercises its rights under a Kirin Antigen Non-Exclusive Commercial License pursuant to and in [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -15- 


 accordance with Section 4.3.2, 4.3.3(d)(ii) or 4.3.4 hereof; provided, however, that any such Antigen shall cease to be a Kirin Non-Exclusive Commercial Target upon the expiration or termination of the Kirin Antigen Non-Exclusive Commercial License granted with respect to such Antigen. 1.125 "Kirin Partner" shall mean, with respect to a Kirin Partner Project, the Third Party with which Kirin (or a Kirin Affiliate, as permitted under Section 8.5.3 hereof) has entered or enters into a Project Agreement governing such Kirin Partner Project. 1.126 "Kirin Partner Payment" shall mean consideration of any type received by Kirin (and/or any Kirin Affiliate(s)) from a Kirin Partner in connection with a Kirin Partner Project, including, without limitation, up front payments, license fees and milestones, but excluding amounts received in the form of (a) royalty payments on sales of products; (b) amounts received, at or below fair market value, for services provided by Kirin (or a Kirin Affiliate), such as producing Antibodies and Manufacturing Antibody Products or conducting research; (c) amounts received, at or below fair market value, for equity in Kirin (or a Kirin Affiliate); (d) equity received from a Partner in exchange for monetary consideration at or above fair market value; or (e) amounts received in the form of a loan to Kirin (or a Kirin Affiliate) or repayment of a loan from Kirin (or a Kirin Affiliate). 1.127 "Kirin Partner Project" shall mean a research, development and/or commercialization project that involves the use of Kirin Mice, KM-Mice and/or Medarex Mice, and/or a grant of rights (including, without limitation, a license or a sublicense) under the Kirin Technology, Medarex Technology and/or KM Patent Rights, to Exploit and/or have Exploited Antibodies originally obtained, isolated, identified or derived from such mice (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) and as to which (a) Kirin (and/or a Kirin Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a written agreement with one or more Third Party(ies) with respect to such Third Party's(ies') Exploitation of the Collaboration Product(s) resulting from such project whereby neither Kirin nor any Kirin Affiliate retains any Substantial Commercialization Rights with respect to such Collaboration Product(s); or (b) Kirin (and/or a Kirin Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a material transfer or other technology evaluation agreement with one or more Third Party(ies) (other than an agreement that grants to such Third Party(ies) a sublicense under a License granted by Medarex to Kirin pursuant to this Agreement) for the purpose of determining whether such Third Party(ies) desires to conduct a project that meets the requirements set forth in clause (a) of this Section; provided, however, that a "Kirin Partner Project" shall not include any (i) project resulting from a Kirin In-House Project; or (ii) Services Project. 1.128 "Kirin Patent Rights" shall mean any and all Patent Rights that Kirin Controls during the period of time commencing on December 27, 1999, and ending on the last day of the Term, including, without limitation, those listed on Exhibit F, that cover the composition or use of any Collaboration Mice or that are necessary for the use of any of the Collaboration Mice or the Exploitation of any Antibody originally obtained, isolated, identified, or derived from one or more Collaboration Mice, or an Antibody Product containing such Antibody, but excluding all Excluded Claims, all KM Patent Rights, all Medarex Patent Rights and additionally excluding all Patent Rights in-licensed by Kirin from a Third Party after the Effective Date. The Kirin Patent Rights shall be deemed to include all patent claim(s) within such Patent Rights that are directed to FcaRII-KO mice and mice produced by breeding any mice with FcaRII-KO mice, which are not within the KM Patent Rights. 1.129 "Kirin Primary Promotional Area" shall mean countries in Asia. 1.130 "Kirin Reservation License" shall mean each license granted to Kirin by Medarex pursuant to Section 8.2.3 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -16-


 1.131 "Kirin Reservation Target" shall mean an Antigen (a) that Kirin has, prior to the Effective Date and in reliance on the Agreement on Essential Terms for Collaboration, designated as an In-House Target; or (b) with respect to which Kirin exercises its rights under a Kirin Reservation License pursuant to and in accordance with Section 4.2.3 hereof; provided, however, that any such Antigen shall cease to be a Kirin Reservation Target upon the expiration of the applicable Reservation License Period or termination of the Kirin Reservation License granted with respect to such Antigen. 1.132 "Kirin Semi-Exclusive Commercial Target" shall mean an Antigen with respect to which Kirin exercises its rights under a Kirin Antigen Semi-Exclusive Commercial License pursuant to and in accordance with Section 4.3.2 or 4.3.4 hereof; provided, however, that any such Antigen shall cease to be a Kirin Semi-Exclusive Commercial Target upon the expiration or termination of the Kirin Antigen Semi-Exclusive Commercial License granted with respect to such Antigen. 1.133 "Kirin Target" shall mean any Kirin Reservation Target, Kirin Non-Exclusive Commercial Target, Kirin Exclusive Commercial Target or Kirin Semi-Exclusive Commercial Target, as the case may be. 1.134 "Kirin Technology" shall mean the Kirin Patent Rights and the Kirin Know-How. 1.135 "Kirin Trademarks" shall mean the Trademarks listed in Exhibit J. 1.136 "KM Know-How" shall mean all Information and Inventions with respect to which Kirin and/or Medarex, during the period of time commencing on December 27, 1999, and ending on the last day of the Term, possesses rights, whether directly or indirectly, whether by ownership, license, contract or otherwise, to assign or grant a license, sublicense or other right, and which Information and Inventions are necessary for (a) the use of any mouse containing both a human immunoglobulin transgene and a human immunoglobulin transchromosome, but not any mouse containing a human immunoglobulin transgene but not a human immunoglobulin transchromosome or any mouse containing a human immunoglobulin transchromosome but not a human immunoglobulin transgene, (b) the Exploitation of any Antibody derived from a mouse described in clause (a), or any Antibody Product containing such Antibody, and/or (c) the performance of activities covered by the KM Patent Rights and are not generally known, but in each case only to the extent conceived, reduced to practice or otherwise developed by one or more employees or agents of Medarex, Medarex Affiliates, Kirin and/or Kirin Affiliates, including, without limitation: (i) biological, chemical pharmacological, toxicological, pharmaceutical, physical and analytical, clinical, safety and quality control data and information necessary to reproduce, raise or use the KM-Mice or Antibodies, cells or nucleic acids originally obtained, isolated, identified or derived from one or more KM-Mice; and (ii) assays and methodologies necessary for the use of KM-Mice; provided, however, that "KM Know-How" excludes any Excluded Know-How and any Information and Inventions to the extent claimed by the KM Patent Rights. 1.137 "KM-MouseTM" shall mean any mouse with respect to which Medarex and/or Kirin possess the right, whether directly or indirectly, and whether by ownership, license, contract or otherwise, to assign or grant a license, sublicense or other right in and to such mouse, and which mouse contains both (a) human immunoglobulin transgene nucleic acids; and (b) human immunoglobulin transchromosome nucleic acids, including, without limitation, any mouse containing the nucleic acids described in clause (a) and clause (b) of this Section that is derived by (i) crossbreeding the HuMAb Mouse(R) with a TC MouseTM, with an HAC MouseTM, and/or with any crossbreed of a TC MouseTM and an HAC MouseTM, (ii) introducing nucleic acids obtained, isolated, identified, or derived from one or more HuMAb Mouse(R) into one or more cells obtained from a TC MouseTM, from an HAC MouseTM, and/or from any crossbreed of a TC MouseTM and an HAC MouseTM, (iii) introducing nucleic acids [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -17-


 obtained, isolated, identified, or derived from one or more TC Mouse(TM), HAC Mouse(TM), and/or any crossbreed of a TC Mouse(TM) and/or HAC Mouse(TM) into one or more cells obtained from a HuMAb Mouse(R), (iv) de novo introduction of human immunoglobulin transgene nucleic acids developed by Medarex or otherwise developed through use of Medarex Mice into the germline of a mouse, or de novo introduction of human immunoglobulin transchromosome nucleic acids developed by Kirin or otherwise developed through use of Kirin Mice into one or more cells of a mouse, or (v) any other method. "KM-Mouse(TM)" shall also include any mouse generated by breeding a KM-Mouse(TM) with either any other KM-Mouse(TM) or any other mouse. For purposes of clarification, no KM-Mouse(TM) shall be deemed to be a Medarex Mouse or Kirin Mouse, or an Improvement to a Medarex Mouse or a Kirin Mouse, nor shall any Medarex Mouse or Kirin Mouse be deemed a KM-Mouse(TM). "KM-Mice" shall mean more than one KM-Mouse(TM). 1.138 "KM Patent Rights" shall mean any and all Patent Rights with respect to which Medarex and/or Kirin, during the period of time commencing on December 27, 1999, and ending on the last day of the Term, possess rights, whether directly or indirectly, whether by ownership, license, contract or otherwise, to assign or grant a license, sublicense or other right, and which Patent Rights (a) cover the composition or use of any mouse containing both a human immunoglobulin transgene and a human immunoglobulin transchromosome, and that do not cover any mouse containing a human immunoglobulin transgene but not a human immunoglobulin transchromosome or any mouse containing a human immunoglobulin transchromosome but not a human immunoglobulin transgene, (b) are necessary for the use of any mouse described in clause (a) above, or (c) are necessary for the Exploitation of any Antibody originally obtained, identified, isolated or derived from any mouse described in clause (a) above, or an Antibody Product containing such Antibody, but excluding all (i) Excluded Claims; and (ii) Patent Rights in-licensed by Kirin or Medarex from a Third Party after the Effective Date. For the avoidance of doubt, patent claims within the Patent Rights that are specifically directed to FcaRII-KO mice and/or mice produced by breeding any mice with FcaRII-KO mice, which contain both a human immunoglobulin transgene and a human immunoglobulin transchromosome shall be deemed within the KM Patent Rights. A list of the KM Patent Rights known to both Parties as of the Effective Date is attached as Exhibit G hereto, and the Parties agree to update such list from time to time to reference any and all other Patent Rights comprising KM Patent Rights (as defined in the previous two sentences). For the purpose of this Section 1.138, a "transgene" shall mean a gene (or genes) that is foreign to the host organism and is inserted and physically integrated into the host genome DNA, and a "transchromosome" shall mean a chromosome, chromosomes, a fragment or fragments thereof, or a vector or vectors derived therefrom, comprising at least one set of telomere and centromere sequences, which sequences enable autonomous replication in the host cell, and is distinct from, noncontiguous with, and is not inserted into the host genome DNA. 1.139 "KM Trademarks" shall mean the Trademarks listed in Exhibit K. In the event that either Party develops additional Trademarks intended for use in connection with the KM-MouseTM, the Parties shall discuss in good faith whether to amend Exhibit K to include such Trademarks as KM Trademarks. 1.140 "Know-How" shall mean the Medarex Know-How or the Kirin Know-How, as the case may be. 1.141 "License" shall mean a Reservation License, an Antigen Exclusive Commercial License, an Antigen Semi-Exclusive Commercial License, or an Antigen Non-Exclusive Commercial License, as the case may be. 1.142 "Licensed Trademarks" shall mean in the case of Medarex, the Medarex Trademarks, and in the case of Kirin, the Kirin Trademarks. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -18-


 1.143 "[*]" shall mean with respect to each Antigen that has been selected by a Party as a Non-Exclusive Commercial Target for the exercise of rights under an Antigen Non-Exclusive Commercial License, [*] with respect to which the licensee Party (and/or its sublicensee) has a right to exercise such License, which [*] is accomplished in accordance with Section 4.4.2 hereof, where applicable. 1.144 "[*]" shall mean, with reference to each Party's In-House Target List, [*]. 1.145 "Lists" shall mean the Antigen Lists and the Antibody Sequence List. 1.146 "Losses" shall mean losses, damages, liabilities, costs, and expenses (including without limitation, reasonable attorneys' fees and expenses) in connection with any and all suits, investigations, claims or demands. 1.147 "Major Country" shall mean [*]. 1.148 "Major European Countries" shall mean [*]. 1.149 "Manufacture" and "Manufacturing" shall mean, with respect to a product or compound, the manufacturing, processing, formulating, packaging, labeling, storage, and/or quality control testing of such product or compound, and, with respect to a process, the use of such process in the manufacture of a product. 1.150 "Marketing Approval" shall mean, with respect to each country, on a Collaboration Product-by-Collaboration Product basis, approval of an applicable MAA filed in such country by the relevant Regulatory Authority in such country; provided, however, that the absence of pricing or reimbursement approval with respect to a Collaboration Product shall not preclude the existence of "Marketing Approval" with respect to such Collaboration Product. 1.151 "Marketing Approval Application" or "MAA" shall mean, on a Collaboration Product-by-Collaboration Product basis, a New Drug Application or Biologics License Application as required under the U.S. Food, Drug and Cosmetics Act and the regulations promulgated thereunder, or a comparable filing in a country other than the United States. 1.152 "Materials" shall mean the Medarex Materials when referring to materials provided or to be provided by Medarex to Kirin and shall mean the Kirin Materials when referring to materials provided or to be provided by Kirin to Medarex. 1.153 "Medarex" shall mean Medarex, Inc. together with GenPharm International, Inc., its wholly-owned subsidiary. 1.154 "Medarex Affiliate" shall mean an Affiliate of Medarex. For purposes of this Agreement, neither GenPharm International, Inc. nor Medarex, Inc. shall be a Medarex Affiliate. 1.155 "Medarex Antigen Exclusive Commercial License" shall mean each license granted to Medarex by Kirin in Section 8.3.4(a) hereof. 1.156 "Medarex Antigen Non-Exclusive Commercial License" shall mean each license granted to Medarex by Kirin in Section 8.3.4(b) hereof. 1.157 "Medarex Antigen Semi-Exclusive Commercial License" shall mean each license granted to Medarex by Kirin in Section 8.3.4(c) hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -19-


 1.158 "Medarex Breeding License" shall mean the license granted to Medarex by Kirin in Section 8.3.1 hereof. 1.159 "Medarex Commercial Target" shall mean a Medarex Exclusive Commercial Target, Medarex Semi-Exclusive Commercial Target or Medarex Non-Exclusive Commercial Target, as the case may be. 1.160 "Medarex Designated Exchange Rate" shall mean the exchange rate published in the Wall Street Journal, Eastern United States Edition, or, if not so available, as otherwise mutually agreed by the Parties in writing. 1.161 "Medarex Evaluation License" shall mean the license granted to Medarex by Kirin in Section 8.3.2 hereof. 1.162 "Medarex Exclusive Commercial Target" shall mean an Antigen with respect to which Medarex exercises its rights under a Medarex Antigen Exclusive Commercial License pursuant to and in accordance with Section 4.3.2, 4.3.3 or 4.3.4(d) hereof; provided, however, that any such Antigen shall cease to be a Medarex Exclusive Commercial Target upon the expiration or termination of the Medarex Antigen Exclusive Commercial License granted with respect to such Antigen. 1.163 "Medarex Improvement" shall mean any Improvement Controlled by Medarex, but excluding any Improvements for which the Patent Rights or other intellectual property rights are in-licensed by Medarex from a Third Party after the Effective Date. 1.164 "Medarex In-House Project" shall mean a research, development and/or commercialization project that involves the use of Kirin Mice and/or KM-Mice, and/or a grant of rights (including, without limitation, a license or a sublicense) under the Kirin Technology and/or KM Patent Rights (whether or not such project also involves the use of Medarex Mice and/or a grant of rights (including, without limitation, a license or a sublicense) under the Medarex Technology), to Exploit and/or have Exploited Antibodies originally obtained, isolated, identified or derived from such mice (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) and as to which (a) substantially all of the research or development effort will come from Medarex's (and/or any Medarex Affiliate(s)'s) internal research or development assets and Medarex (and/or any Medarex Affiliate(s)) retains Substantial Commercialization Rights with respect to the Antibody Product(s) resulting from such project; (b) Medarex (and/or any Medarex Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a written collaborative research, development and/or commercialization agreement with one or more Medarex Affiliate(s) or Third Party(ies) with respect to the Exploitation of the Antibody Product(s) resulting from such project in exchange for Medarex (and/or a Medarex Affiliate) receiving Substantial Commercialization Rights thereto; or (c) Medarex (and/or any Medarex Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a material transfer or other technology evaluation agreement with one or more Medarex Affiliate(s) or Third Party(ies) (other than an agreement that grants to such Medarex Affiliate or Third Party(ies) a sublicense under a License granted by Kirin to Medarex pursuant to this Agreement) for the purpose of determining whether Medarex (and/or such Medarex Affiliate(s)) and such Medarex Affiliate(s) or Third Party(ies) desire to conduct a project that meets the requirements set forth in clause (b) of this Section; provided, however, that Medarex's (and/or Medarex Affiliate(s)'s) use of subcontractors for research, development, or Manufacturing activities relating to such project shall not affect the characterization of a project as a "Medarex In-House Project" so long as Medarex and/or such Medarex Affiliate retains Substantial Commercialization Rights with respect to the Antibody Product(s) resulting from such project; provided, further, that a "Medarex In-House Project" shall not include any HuMAb Project. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -20-


 1.165 "Medarex In-License Agreement" shall mean a license agreement listed on Exhibit C. 1.166 "Medarex Internal Project" shall mean an existing or future HuMAb Project of Medarex (and/or a Medarex Affiliate(s)) with respect to which Medarex (and/or a Medarex Affiliate(s)) retains Substantial Commercialization Rights to Antibody Products resulting from such project, and which project is not subject to the terms of any Project Agreement with a Third Party. 1.167 "Medarex Internal Project List" shall mean a list of all Antigens selected by Medarex (and/or a Medarex Affiliate(s)) for Medarex Internal Projects, which list Medarex maintains pursuant to Section 2.2.2 hereof. 1.168 "Medarex Know-How" shall mean all Information and Inventions in the Control of Medarex during the period of time commencing on December 27, 1999, and ending on the last day of the Term, and which Information and Inventions are necessary for the use of the Medarex Mice, any Antibody derived from Medarex Mice, any Antibody Product containing such Antibody, and/or the performance of activities covered by the Medarex Patent Rights and that are not generally known, but only to the extent conceived, reduced to practice, or otherwise developed by one or more employees or agents of Medarex, including, without limitation, (a) biological, chemical, pharmacological, toxicological, pharmaceutical, physical and analytical, clinical, safety, and quality control data and information necessary to reproduce, raise, or use the Medarex Mice or Antibodies, cells, or nucleic acids originally obtained, isolated, identified, or derived from one or more of the Medarex Mice; (b) assays and methodologies necessary for the use of the Medarex Mice; provided, however, that "Medarex Know-How" excludes any Excluded Know-How, KM Know-How and any Information and Inventions to the extent claimed by the Medarex Patent Rights. 1.169 "Medarex Lists" shall have the meaning set forth in Section 2.1.1 hereof. 1.170 "Medarex Materials" shall mean Medarex Mice and/or KM-Mice provided or to be provided by or on behalf of Medarex to Kirin or any Kirin Affiliate pursuant to Section 9.1.1(a) hereof. 1.171 "Medarex Mouse" shall mean any (a) HuMAb Mouse(R); and (b) any Improvement of a HuMAb Mouse(R); provided, however, that in no event shall any mouse classified as a TC Mouse(TM), HAC Mouse(TM), KM-Mouse(TM), or an Improvement of a TC Mouse(TM), HAC Mouse(TM), or KM-Mouse(TM) be deemed to be a "Medarex Mouse." "Medarex Mice" shall mean more than one Medarex Mouse. 1.172 "Medarex Non-Exclusive Antigen List" shall mean a list identifying each Antigen (other than an Antigen that is a ROFR Target) with respect to which Medarex (a) from time to time during the Term exercises its rights under a Reservation License and/or an Antigen Non-Exclusive Commercial License in accordance with the terms and conditions of Article IV hereof; (b) prior to the Effective Date has entered into an agreement that provides for the grant to a Medarex Affiliate or Third Party of a license or other rights (including, without limitation, an option or a right of first refusal) in and to the Medarex Mice, Kirin Mice and/or KM-Mice to raise Antibodies against such Antigen on an Antigen non-exclusive basis; and (c) prior to or during the Term, exercises or grants rights on an Antigen non-exclusive basis in connection with a HuMAb Project. 1.173 "Medarex Non-Exclusive Commercial Target" shall mean an Antigen with respect to which Medarex exercises its rights under a Medarex Antigen Non-Exclusive Commercial License pursuant to and in accordance with Section 4.3.2, 4.3.3 or 4.3.4(d) hereof; provided, however, that any such Antigen shall cease to be a Medarex Non-Exclusive Commercial Target upon the expiration or [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -21-


 termination of the Medarex Antigen Non-Exclusive Commercial License granted with respect to such Antigen. 1.174 "Medarex Partner" shall mean, with respect to a Medarex Partner Project, the Third Party with which Medarex (and/or a Medarex Affiliate, as permitted under Section 8.5.3) has entered or enters into a Project Agreement governing such Medarex Partner Project. 1.175 "Medarex Partner Payment" shall mean consideration of any type received by Medarex (and/or any Medarex Affiliate(s)) from a Partner in connection with a Medarex Partner Project, including, without limitation, up front payments, license fees and milestones, but excluding amounts received in the form of (a) royalty payments on sales of products; (b) amounts received, at or below fair market value, for services provided by Medarex (or a Medarex Affiliate), such as producing Antibodies and Manufacturing Antibody Products or conducting research; (c) amounts received, at or below fair market value, for equity in Medarex (or a Medarex Affiliate); (d) equity received from a Partner in exchange for monetary consideration at or above fair market value; or (e) amounts received in the form of a loan to Medarex (or a Medarex Affiliate) or repayment of a loan from Medarex (or a Medarex Affiliate); provided, however, that Partner Payments shall not include any consideration received by Medarex (and/or any Medarex Affiliate(s)) from a Medarex Partner in connection with a Medarex Partner Project to the extent that such consideration was provided in exchange for access to, the right to immunize, and/or the grant of a license that covers, Medarex Mice or to the extent such consideration relates to a product or process that was not developed using Kirin Mice or KM-Mice. For purposes of this definition, in the event that any such consideration is received by Medarex (and/or any Medarex Affiliate(s)) from any Medarex Partner in exchange for the grant by Medarex (or a Medarex Affiliate) to such Medarex Partner of access, the right to immunize and/or a license, which access is to, and the right to immunize and/or such license [*] shall constitute a "Medarex Partner Payment"; provided, however, that in the event Medarex (or a Medarex Affiliate) grants access to, the right to immunize, or a license that [*] and the [*]." 1.176 "Medarex Partner Project" shall mean a research, development and/or commercialization project that involves the use of Kirin Mice and/or KM-Mice, and/or a grant of rights (including, without limitation, a license or a sublicense) under the Kirin Technology and/or KM Patent Rights (whether or not such project also involves the use of Medarex Mice and/or a grant of rights (including, without limitation, a license or a sublicense) under the Medarex Technology), to Exploit and/or have Exploited Antibodies originally obtained, isolated, identified or derived from such mice (and/or Antibody Materials related thereto and/or Antibody Products containing such Antibodies) and as to which (a) Medarex (and/or a Medarex Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a written agreement with one or more Third Party(ies) with respect to such Third Party's(ies') Exploitation of the Collaboration Product(s) resulting from such project whereby neither Medarex nor any Medarex Affiliate retains any Substantial Commercialization Rights with respect to such Collaboration Product(s); or (b) Medarex (and/or a Medarex Affiliate(s), as permitted under Section 8.5.3 hereof) has entered into a material transfer or other technology evaluation agreement with one or more Third Party(ies) (other than an agreement that grants to such Third Party(ies) a sublicense under a License granted by Kirin to Medarex pursuant to this Agreement) for the purpose of determining whether such Third Party(ies) desires to conduct a project that meets the requirements set forth in clause (a) of this Section; provided, however, a "Medarex Partner Project" shall not include any (i) project resulting from a Medarex In-House Project or HuMAb License Project; (ii) HuMAb Project; or (iii) Services Project. 1.177 "Medarex Patent Rights" shall mean any and all Patent Rights that Medarex Controls as of December 27, 1999, and during the Term, including, without limitation, those listed on Exhibit H, in each case that cover the composition or use of any Collaboration Mice, or that are necessary for the Exploitation of any of the Collaboration Mice, or any Antibody originally obtained, isolated, identified, or [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -22-


 derived from one or more of the Collaboration Mice, or an Antibody Product containing such Antibody, but excluding all Excluded Claims, all Kirin Patent Rights, all KM Patent Rights and all Patent Rights in-licensed by Medarex from a Third Party after the Effective Date. 1.178 "Medarex Primary Promotional Area" shall mean countries outside of Asia. 1.179 "Medarex Reservation License" shall mean each license granted to Medarex by Kirin in Section 8.3.3 hereof. 1.180 "Medarex Reservation Target" shall mean an Antigen with respect to which Medarex exercises its rights under a Medarex Reservation License pursuant to and in accordance with Section 4.2.2 hereof; provided, however, that any such Antigen shall cease to be a Medarex Reservation Target upon the expiration of the applicable Reservation License Period or termination of the Medarex Reservation License granted with respect to such Antigen. 1.181 "Medarex Restricted Antigen List" shall mean a list identifying each Antigen with respect to which Medarex (a) prior to December 27, 1999, has entered into an agreement that provides for the grant to an Affiliate or a Third Party of a license or other rights (including, without limitation, an option or a right of first refusal) in and to the Medarex Mice, Kirin Mice and/or KM-Mice to raise Antibodies against such Antigen on an Antigen-exclusive basis; or (b) on or after December 27, 1999, has entered or enters into an agreement with an Affiliate or Third Party that provides for the grant to an Affiliate or Third Party of a license or other rights (including, without limitation, an option or a right of refusal) in connection with a HuMAb Project (other than a Medarex Internal Project) to raise Antibodies against such Antigen on an Antigen-exclusive basis. 1.182 "Medarex Semi-Exclusive Commercial Target" shall mean an Antigen with respect to which Medarex exercises its rights under a Medarex Antigen Semi-Exclusive Commercial License pursuant to and in accordance with Section 4.3.2 or 4.3.3 hereof; provided, however, that any such Antigen shall cease to be a Medarex Semi-Exclusive Commercial Target upon the expiration or termination of the Medarex Antigen Semi-Exclusive Commercial License granted with respect to such Antigen. 1.183 "Medarex Target" shall mean any Medarex Reservation Target, Medarex Non-Exclusive Commercial Target, Medarex Exclusive Commercial Target, or Medarex Semi-Exclusive Commercial Target, as the case may be. 1.184 "Medarex Technology" shall mean the Medarex Patent Rights and the Medarex Know-How. 1.185 "Medarex Trademarks" shall mean the Trademarks listed in Exhibit L. 1.186 "Mice Material" shall mean, with respect to any Collaboration Mice, parts or derivatives of such mice, including hybridomas, cells or other biological materials, nucleic acids (including DNA, RNA, and complementary and reverse complementary nucleic acids thereto, whether coding or noncoding and whether intact or a fragment), and any replicates or modifications of any of the foregoing, but excluding any Antibody(ies) and any Antibody Material(s). 1.187 "Milestone Event" shall have the meaning set forth in Section 10.1.3 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -23-


 1.188 "[*] Partner Payments" shall mean the [*] amounts payable by a Party to the other Party in connection with Partner Payments received by the first Party from a Partner as calculated in accordance with Section 10.7.5 hereof. 1.189 "[*]" shall have the meaning set forth in Section 10.1.3 hereof. 1.190 "MRC Agreement" shall mean that certain License Agreement entered into by the Medical Research Council, Agricultural and Food Research Council Institute of Animal Physiology and Genetics Research of Babraham Hall, and Dr. Marianne Bruggemann, on the one hand, (collectively, the "MRC Parties") and GenPharm International, Inc., on the other hand, effective October 1, 1993, as amended on August 12, 1994, and on April 19, 2002, and as amended further from time to time, which further amendment(s) is consistent with Section 16.2.2 hereof. "MRC" shall mean the MRC Parties, or their respective assign(s) or successor(s)-in-interest under the MRC Agreement, as applicable. 1.191 "Net Sales" shall mean the gross amount invoiced by a Party, its Affiliates, licensees and sublicensees to Third Parties for sales of Collaboration Products, less deductions for (a) normal and customary trade, quantity and cash discounts and sales returns and allowances (other than allowances for doubtful accounts), including, without limitation, (i) those granted on account of price adjustments, billing errors, rejected goods, damaged goods, returns and rebates, (ii) administrative and other fees and reimbursements and similar payments directly related to the sale or delivery of Collaboration Product(s) paid to wholesalers and other distributors, buying groups, pharmacy benefit management organizations, health care insurance carriers and other institutions, (iii) allowances, rebates and fees directly related to the sale or delivery of Collaboration Product(s) paid to distributors and (iv) chargebacks; (b) freight, postage, shipping and insurance costs to the extent that such items are included in the gross amount invoiced; (c) customs and excise duties and other duties related to the sales to the extent that such items are included in the gross amount invoiced; (d) rebates and similar payments made with respect to sales paid for or reimbursed by any governmental or regulatory authority such as, by way of illustration and not in limitation of the Parties' rights hereunder, Federal or state Medicaid, Medicare or similar state program or equivalent foreign governmental program; (e) sales and other taxes and duties directly related to the sale or delivery of Collaboration Product(s) (but not including taxes assessed against the income derived from such sale); (f) distribution costs and expenses to the extent that such items are included in the gross amount invoiced; and (g) any such invoiced amounts that are not collected by the Parties or their Affiliates, licensees or sublicensees after the Party, Affiliate, licensee or sublicensee has made commercially reasonable efforts to collect the same; provided, however, that an amount shall be deducted only once regardless of how many categories may apply to it. Any of the deductions listed in (a) through (f) above that involves a payment by a Party or its Affiliates, licensees or sublicensees shall be taken as a deduction in the Calendar Quarter in which the payment is accrued by such entity. Deductions pursuant to clause (g) above shall be taken in the Calendar Quarter in which such sales are no longer recorded as a receivable. For purposes of determining Net Sales, the Collaboration Product(s) shall be deemed to be sold when invoiced and a "sale" shall not include transfers or dispositions for charitable, promotional, pre-clinical research, clinical-trial, regulatory or governmental purposes, in any such case, to the extent not for fair market value. For purposes of calculating Net Sales of Collaboration Products, sales between or among the Parties or their Affiliates, licensees, or sublicensees shall be excluded from the computation of Net Sales, but sales by a Party or its Affiliates, licensees, or sublicensees to other Third Parties shall be included in the computation of Net Sales. In the event that a Collaboration Product is sold in any country in the form of a combination product containing one or more active ingredients in addition to any Collaboration Antibody contained in such product, the Parties shall negotiate in good faith to determine what portion of the net sales of such combination product in such country shall be treated as "Net Sales" under this Agreement, which [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -24-


 determination shall be based on the value added by such Collaboration Antibody, compared to the value added by such other active ingredients, to the invoice price of such combination. 1.192 "Non-Contracting Party" shall mean, with respect to any Project Agreement governing a Partner Project entered into or contemplated by a Contracting Party, the Party other than the Contracting Party. 1.193 "Non-Designating Party" shall mean, with respect to any In-House Target, the Party other than the Party that designates such Target on its In-House Target List. 1.194 "Non-Exclusive Antigen List" shall mean either the Kirin Non-Exclusive Antigen List or the Medarex Non-Exclusive Antigen List, as the case may be. 1.195 "Non-Exclusive Commercial Target" shall mean a Kirin Non-Exclusive Commercial Target or a Medarex Non-Exclusive Commercial Target, as the case may be. 1.196 "Non-Paying Party" shall mean, with respect to any Project Agreement entered into by a Party that governs a Partner Project, the Party other than the Party that is required to make [*] Partner Payments pursuant to Section 10.7.5 hereof. 1.197 "Non-Requesting Party" shall mean the Party to which the Requesting Party may make requests pursuant to Section 6.4 hereof. 1.198 "Non-Responsible Party" shall mean (a) Kirin in the case of [*] to prosecute and/or maintain pursuant to Section 12.2.1(b) hereof; (b) Medarex in the case of any [*] to prosecute and/or maintain pursuant to Section 12.2.2(b) hereof; and (c) in the case of any KM Patent Rights and KM Trademarks, the Party other than the Party that has the first right of preparation, filing, prosecution and maintenance of such KM Patent Rights and registrations of such KM Trademarks pursuant to Section 12.2.4(a) hereof. 1.199 "Non-Terminating Party" shall have the meaning set forth in Section 8.7.1 hereof. 1.200 "Notice of Rights Preserving Excuse" shall have the meaning set forth in Section 8.11.3 hereof. 1.201 "Obligor Party" shall have the meaning set forth in Section 8.11.1 hereof. 1.202 "Opt-In Offer" shall mean, with respect to a Target added by the Designating Party to its In-House Project List, an offer made in good faith by the Designating Party to the Non-Designating Party which if accepted would entitle the Non-Designating Party to obtain Commercialization Rights with respect to any Collaboration Product(s) containing a Collaboration Antibody(ies) developed, in whole or in part, by the Designating Party (and/or its In-House Collaborator) against a particular Target, which in the case of Medarex as the Non-Designating Party shall include [*], and in the case of Kirin as the Non-Designating Party shall include [*]. 1.203 "Opt-Out" shall mean an election made by a Party, its Affiliate and/or its In-House Collaborator(s) pursuant to which election the electing Person relinquishes its rights to pursue research, development, and commercialization activities with respect to one or more Antibodies raised against and with affinity for a Target designated by such Party on its In-House Target List. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -25-


 1.204 "Original Antibody Inquiry Response Period" shall have the meaning set forth in Section 3.5.2(a) hereof. 1.205 "Original Antigen Inquiry Response Period" shall have the meaning set forth in Section 3.3.1(d)(i) hereof. 1.206 "Partner" shall mean either a Medarex Partner or a Kirin Partner, as the case may be. 1.207 "Partner Payment" shall mean a Medarex Partner Payment received by Medarex (or a Medarex Affiliate) from a Medarex Partner or a Kirin Partner Payment received by Kirin (or a Kirin Affiliate) from a Kirin Partner, as the case may be. 1.208 "Partner Project" shall mean a Medarex Partner Project or a Kirin Partner Project, as the case may be. 1.209 "Partner Project Status Change" shall mean a change that a Party intends to make or actually makes in accordance with Section 7.2 hereof in its rights to an Antibody(ies) raised against and with affinity for a particular Antigen (and Antibody Materials and Antibody Products relating thereto) in connection with a Partner Project with the result that such project would no longer satisfy the definition of a Partner Project and would instead qualify as an In-House Project hereunder, which change shall include, without limitation, the exercise of an option held by such Party for Substantial Commercialization Rights. 1.210 "Partner Project Status Change Date" shall mean the date on which a Party effects a Partner Project Status Change in accordance with Section 7.2 hereof. 1.211 "Partner Royalties" shall mean any royalty payments received by Medarex (and/or a Medarex Affiliate) or by Kirin (and/or a Kirin Affiliate), as the case may be, from a Partner in connection with a Partner Project; provided, however, that with respect to Medarex[*]. 1.212 "Patent Rights" shall mean (a) all patents and patent applications (and any claims contained therein), wherever filed; (b) all patents and patent applications arising out of the patent applications and/or patents described in clause (a), including all substitutions, divisions, continuations, continuations-in-part, reissues, renewals, registrations, confirmations, re-examinations, extensions, supplementary protection certificates and the like, and any provisional applications, of any such patents or patent application; and (c) any foreign or international equivalent of any of the foregoing (including, without limitation, a PCT application). 1.213 "Paying Party" shall mean, with respect to any Project Agreement entered into by a Party governing a Partner Project, the Party that is required to make [*] Partner Payments to the other Party pursuant to Section 10.7.5 hereof. 1.214 "Person" shall mean an individual, sole proprietorship, partnership, limited partnership, limited liability partnership, corporation, limited liability company, business trust, joint stock company, trust, unincorporated association, joint venture or other similar entity or organization, including a government or political subdivision, department or agency of a government. 1.215 "Phase I Trial" shall mean a human clinical trial, the principal purpose of which is a preliminary determination of safety in healthy individuals or patients as required in 21 C.F.R. ss. 312, or a similar clinical study prescribed by the Regulatory Authorities in a country other than the United States. A Phase I Clinical Trial shall be deemed to have commenced when the first subject in the study has been [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -26-


 enrolled. For the avoidance of doubt, a combined Phase I / Phase II Trial shall be deemed a Phase I Trial for the purposes of this Agreement. 1.216 "Phase II Trial" shall mean a human clinical trial for which a primary endpoint is a preliminary determination of efficacy or dose ranges in patients with the disease being studied as required in 21 C.F.R. ss. 312, or a similar clinical study prescribed by the Regulatory Authorities in a country other than the United States. A Pivotal Study shall automatically be deemed to have reached Phase II status. A Phase II Trial shall be deemed to have commenced when the first subject in the study has been enrolled. 1.217 "Phase III Trial" shall mean a human clinical trial, the principal purpose of which is to establish safety and efficacy in patients with the disease being studied as required in 21 C.F.R. ss. 312, or similar clinical study prescribed by the Regulatory Authorities in a country other than the United States. A Phase III Trial shall also include any other human clinical trial intended as a Pivotal Study, whether or not such study is a traditional Phase III Trial. A Phase III Trial shall be deemed to have commenced when the first patient has been enrolled in a Pivotal Study. 1.218 "Pivotal Study" shall mean any well-controlled study intended to provide the substantial evidence of efficacy necessary to support the filing of an approvable MAA (such as a combined Phase II Trial / Phase III Trial, or any Phase III Trial in lieu of a Phase II Trial). 1.219 "Primary Promotional Area" shall mean the Medarex Primary Promotional Area or Kirin Primary Promotional Area, as the case may be. 1.220 "Production Process Development" shall mean the development of processes and technology for the identification, isolation, selection, modification, production, purification, evaluation, characterization, stabilization, vialing and distribution, or release of an Antibody, Antibody Materials, or Antibody Product, including, without limitation, hybridoma fusion technology, phage display technology, isolation of variable region genes, modification of antibody variable and/or constant regions, development of antibody expression vectors, development of recombinant cells for antibody expression, development of antibody purification processes, and development of antibody stabilization processes or formulations. 1.221 "Production Process Know-How" shall mean any Information and Inventions of a Party with respect to the Production Process Development or the Manufacture of Antibody(ies), Antibody Material(s), or Antibody Product(s), but excluding any Information and Inventions to the extent covered or claimed by the Production Process Patents. 1.222 "Production Process Patents" shall mean any patent claims contained in Patent Rights to the extent that they claim or cover the Production Process Development or the Manufacture of an Antibody(ies), Antibody Material(s), or Antibody Product(s). 1.223 "Production Process Technology" shall mean any Production Process Know-How and Production Process Patents. 1.224 "Project Agreement" shall mean any agreement entered into between a Party (and/or an Affiliate(s) of such Party, as permitted under Section 8.5.3 hereof to the extent applicable) and one or more of such Party's Affiliate(s) or Third Party(ies) that governs one or more Partner Projects and/or In-House Projects (or, with respect to Medarex, HuMAb Collaboration Projects and/or HuMAb License Projects), but excluding any agreement between a Party (and/or its Affiliate) and a Third Party that is entered into solely in connection with the grant by a Third Party to the Party (and/or its Affiliate) of a [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -27-


 license or other rights with respect to intellectual property that falls within the definition(s) of Excluded Claims and/or Excluded Know-How. 1.225 "Reagent" shall mean an Antibody Product used in an assay or test to detect, measure, examine, analyze or produce substances for research (i.e., non-therapeutic, non-prophylactic and non-diagnostic) purposes, but excluding any In Vivo Therapeutic Application, Ex Vivo Therapeutic Application, or Diagnostic Application. 1.226 "Receiving Party" shall have the meaning set forth in Section 8.11.1 hereof. 1.227 "Reconciliation Amount" shall have the meaning set forth in Section 10.1.3 hereof. 1.228 "Refusal Rights" shall mean a right of refusal, offer or negotiation (but excluding an option), in each case to obtain an exclusive, worldwide license or other exclusive rights relating to a particular Antigen. 1.229 "Regulatory Approval" shall mean any and all approvals (including pricing and reimbursement approvals), licenses, registrations or authorizations of any Regulatory Authority, necessary for the Exploitation of a Collaboration Product in a country, including any (a) approval of such Collaboration Product, including without limitation any INDs, New Drug Applications, Biologic License Applications (in each case as required under the U.S. Food, Drug and Cosmetic Act, as amended, and the regulations promulgated thereunder), and supplements and amendments thereto; (b) pre- and post-approval marketing authorizations (including any prerequisite Manufacturing approval or authorization related thereto); and (c) labeling approval. 1.230 "Regulatory Authority" shall mean the U.S. Food and Drug Administration and any applicable supra-national, federal, national, regional, state, provincial or local regulatory agencies, departments, bureaus, commissions, councils or other government entities equivalent thereto. 1.231 "[*]" shall mean a Collaboration Antibody that is raised against and with affinity for an Antigen that is the subject of a Commercial License granted by a Party to the other Party and that the licensee Party desires to [*] pursuant to Section 4.4.2 hereof. 1.232 "[*]" shall mean the date as of which a [*] is deemed to be [*] for a Commercial License pursuant to Section 4.4.2(c) hereof. 1.233 "[*]" shall have the meaning set forth in Section 8.11.3 hereof. 1.234 "Requesting Party" shall mean the Party that has a right to make requests to the other Party and actually makes such requests pursuant to Section 6.4 hereof. 1.235 "Reservation License" shall mean a Kirin Reservation License or a Medarex Reservation License, as the case may be. 1.236 "Reservation License Fee" shall mean the amount, if any, payable by a Party to the other Party pursuant to Sections 10.2.1 and 10.2.2 hereof, as applicable. 1.237 "Reservation License Period" shall mean, on a Reservation Target-by-Reservation Target basis, the period commencing on the date that the Party exercises its rights under a Reservation License with respect to a particular Reservation Target pursuant to Section 4.2.2 or 4.2.3 hereof, as applicable, and ending on the [*] months after such date, or in the case of a renewal of a Reservation License pursuant to [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -28-


 Section 4.2.4 hereof, [*] months after the date on which such License is renewed, as the case may be; or (b) the date on which such Party exercises its rights under a Commercial License with respect to such Reservation Target pursuant to Section 4.3 hereof; provided, however, that with respect to any Reservation License that Medarex is deemed to grant to Kirin pursuant to Section 8.8.3 hereof, the "Reservation License Period" shall be the period set forth in Section 8.8.3 hereof with respect to each such Reservation License. 1.238 "Reservation Target" shall mean a Kirin Reservation Target or a Medarex Reservation Target, as the case may be. 1.239 "Responsible Party" shall mean (a) Medarex in the case of [*] to prosecute and/or maintain pursuant to Section 12.2.1(b) hereof; (b) Kirin in the case of [*] to prosecute and/or maintain pursuant to Section 12.2.2(b) hereof; and (c) in the case of any KM Patent Rights and KM Trademarks, the Party that has the first right of preparation, filing, prosecution and maintenance of KM Patent Rights and registrations of KM Trademarks pursuant to Section 12.2.4(a) hereof. 1.240 "Rights Preserving Excuse" shall have the meaning set forth in Section 8.11.1 hereof. 1.241 "ROFR Party" shall mean either (a) a Third Party to which a Party has granted rights to a ROFR Target prior to the Effective Date (regardless of whether an Antigen has been selected by such Third Party prior to the Effective Date as an Antigen for which such Third Party shall have Refusal Rights); or (b) Kirin, with respect to Antigens that Kirin has selected as In-House Targets prior to the Effective Date, as confirmed by the Shared Exclusive Antigen List. 1.242 "ROFR Target" shall mean (a) an Antigen that is or becomes the subject of Refusal Rights which a Party has granted or is contractually required to grant to a Third Party as a result of an agreement between such Party (or any of its Affiliates) and a Third Party that was entered into prior to the Effective Date (regardless of whether the Antigen(s) with respect to which the Third Party shall have Refusal Rights is selected by such Third Party prior to the Effective Date), without giving effect to any renewal, extension, revision, amendment or other modification to such agreement entered into after the Effective Date that provides to the Third Party (i) a right to designate an additional number of Antigens to which such Third Party shall have Refusal Rights; or (ii) that provides for any extension of time for such Third Party to exercise its Refusal Rights (other than any extension provided for in such agreement as it exists as of the Effective Date), or (b) an Antigen that Kirin has selected as an In-House Target prior to the Effective Date, as confirmed by the Shared Exclusive Antigen List; provided, however, that in the case of any Antigen selected by Kirin as an In-House Target prior to the Effective Date, such Antigen shall be a ROFR Target only for the period beginning on the Designation Date for such Antigen and ending on the [*] of such date, or such earlier date as such ROFR Rights are terminated in accordance with Section 4.3.3(e) hereof, at which time such ROFR Target shall remain a Kirin Reservation Target until the end of Reservation License Period or until Kirin abandons such Kirin Reservation Target pursuant to Section 5.4 hereof. 1.243 "SEC" shall mean the United States Securities and Exchange Commission. 1.244 "Selected Antibody" shall mean a Collaboration Antibody [*] for a Commercial License pursuant to Section 4.4.2(a)(ii), 4.4.2(b)(ii), or 4.4.2(c) hereof, as applicable; provided, however, that in the case of any Special Licensee, for purposes of this Agreement, including for purposes of any license or other rights granted to Medarex by Kirin in this Agreement, "Selected Antibody" shall mean each antibody with respect to which the Special Licensee has a license, option, or right of refusal or negotiation to acquire a license under the Special License, subject to the terms and conditions of the Special License. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -29-


 1.245 "[*]" shall have the meaning set forth in Section 2.3.6(a) hereof. 1.246 "Semi-Exclusive Commercial Target" shall mean a Kirin Semi-Exclusive Commercial Target or a Medarex Semi-Exclusive Commercial Target, as the case may be. 1.247 "Services Project" shall mean a project conducted pursuant to an agreement between a Party (and/or its Affiliate) and an Affiliate of such Party or a Third Party, which agreement provides for the use of any Collaboration Mice and/or the grant of rights under any Technology and/or KM Patent Rights, solely in connection with the performance of contract services by such Affiliate or Third Party on behalf of such Party (and/or its Affiliate), which services include or consist of breeding or immunizing any Collaboration Mice, preclinical studies or clinical trial programs with respect to Antibodies or Antibody Products, Manufacturing services and/or Manufacturing process development services. 1.248 "Shared Exclusive Antigen List" shall mean a list identifying each Antigen, other than an Antigen included on the Medarex Restricted Antigen List, that (a) has been selected or is selected in accordance with the terms and conditions of Article IV hereof (i) by Medarex on an Antigen-exclusive basis in connection with a Medarex Internal Project; (ii) by Medarex or Kirin for the exercise of its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License; or (b) is a ROFR Target. 1.249 "[*]" shall have the meaning set forth in Section [*] hereof. 1.250 "Special Licensees" shall mean those certain licensees of Medarex that hold Special Licenses, as further identified in a writing delivered by Medarex to Kirin with respect to this Section 1.250 on the date of execution of this Agreement, which licensees are sometimes referred to herein individually as "Special Licensee No. 1", "Special Licensee No. 2", "Special Licensee No. 3" and "Special Licensee No. 4". 1.251 "Special Licenses" shall mean those license agreements entered into between Medarex and one or more Third Parties, as identified in a writing delivered by Medarex to Kirin with respect to this Secton 1.251 on the date of execution of this Agreement, which licenses are sometimes referred to herein individually as "Special License No. 1", "Special License No. 2", "Special License No. 3" and "Special License No. 4"; provided, however, that in no event shall any renewal, extension, revision, amendment or other modification thereof entered into after the Effective Date, to the extent that such renewal, extension, revision, amendment, or other modification provides to the Special Licensee any additional rights to access or use for research, development, or commercial purposes the Kirin Mice, KM-Mice, the Kirin Technology, or KM Patent Rights, be deemed to be a Special License for any purpose under this Agreement; provided, further, that for purposes of any payment obligations owed by Medarex to Kirin pursuant to Sections 10.2.2, 10.3.1(b), and 10.7.4 hereof, the special financial terms accorded to Special Licenses under such Sections shall be deemed not to apply to any renewal, extension, revision, amendment or other modification made to a Special License at any time on or after December 27, 1999, to the extent that any such renewal, extension, revision, amendment, or other modification provides to the Special Licensee, in addition to the rights granted to the Special Licensee prior to such date, any rights to access or use for research, development and/or commercial purposes any Kirin Mice, KM Mice, Kirin Technology or KM Patent Rights. By way of an example and without limitation, if Medarex grants to a Special Licensee, pursuant to a Special License entered into prior to December 27, 1999, a right to obtain five (5) Antigen-exclusive commercial licenses under Kirin Technology and/or KM Patent Rights, and if any renewal, extension, revision, amendment or other modification to the applicable Special License on or after December 27, 1999, grants to the Special Licensee a right to obtain ten (10) Antigen-exclusive commercial licenses under such technology, for purposes of any payment obligation owed by Medarex to [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -30-


 Kirin pursuant to Sections 10.2.2, 10.3.1(b), and 10.7.4 hereof, the special financial terms accorded to such Special License under such Sections shall be accorded to the renewed, extended, revised, amended or modified Special License only with respect to the five (5) such licenses originally granted under the form of Special License entered into with such Special Licensee prior to December 27, 1999. Notwithstanding the foregoing, any renewal, extension, revision, amendment, or other modification of a Special License entered into by Medarex and a Special Licensee in connection with negotiations conducted by Medarex at Kirin's request pursuant to a separate writing signed by both Parties, shall not affect the status of such agreement as a Special License; provided, however, that any such renewal, extension, revision, amendment or other modification beyond that which has been requested by Kirin and that is inconsistent with the terms of this Agreement shall be subject to Kirin's prior written consent, which consent shall not be unreasonably withheld. 1.252 "Special Relationship" shall mean, with respect to a Party and a Third Party, either that (a) as of December 27, 1999, there was in force a Transfer Agreement between such Party (or its Affiliate(s)) and such Third Party, and that as of such date there was not in force a Transfer Agreement between such Third Party and the other Party hereto; (b) as of December 27, 1999, there was in force a Transfer Agreement between such Party (or its Affiliate(s)) and such Third Party, and as of such date there was also in force a Transfer Agreement between such Third Party and the other Party hereto (or its Affiliate(s)), but the Transfer Agreement of the first Party (or its Affiliate(s)) predates the Transfer Agreement of the other Party (or its Affiliate(s)), and, if Kirin (or its Affiliate(s)) is such first Party, Medarex (or its Affiliate(s)) did not have a Transfer Agreement with such Third Party with respect to Antibodies as of December 27, 1999; or (c) a Transfer Agreement had been in force between such Party (or its Affiliate(s)) and such Third Party within three (3) years prior to December 27, 1999, and there was not in force, and had not been in force within two (2) years prior to December 27, 1999, a Transfer Agreement between such Third Party and the other Party hereto (or its Affiliate(s)). 1.253 "Substantial Commercialization Rights" shall mean commercialization rights with respect to an Antibody Product that shall include at least rights (including, without limitation, a license but not [*]) to engage in marketing or promotional activities relating to such Antibody Product in at least [*] and to share in at least [*] of the economic benefit derived from such Antibody Product in such [*]. 1.254 "[*]" shall have the meaning set forth in Section 10.7.5(c)(ii) hereof. 1.255 "Target" shall mean a Medarex Target or a Kirin Target, as the case may be. 1.256 "TC Mouse(TM)" shall mean any immunizable transchromosomic mouse developed by or for Kirin and/or Kirin Affiliates that contains one or more human chromosomes or fragments thereof that include centromere and telomere sequences that provide for replication outside of mouse chromosomes, and which chromosome(s) or fragment(s) comprises an unrearranged human immunoglobulin locus; provided, however that in no event shall a Medarex Mouse, a HAC Mouse(TM) or a KM-Mouse(TM) be considered a "TC Mouse(TM)" for any purpose. 1.257 "Technology" shall mean Medarex Technology or Kirin Technology, as the case may be. 1.258 "Term" shall mean the period beginning on the Effective Date and continuing until December 31, 2014, unless terminated at an earlier date in accordance with the terms and conditions set forth in Article XIV hereof. 1.259 "Terminating Party" shall have the meaning set forth in Section 8.7.1 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -31-


 1.260 "Third Party" shall mean any Person other than Medarex, Kirin, or their respective Affiliates. 1.261 "Third Party Claim" shall mean claims of any Third Party subject to indemnification pursuant to Section 15.1 or 15.2.1 hereof. 1.262 "Third Party IP Infringement Suit" shall mean a trademark, patent or other infringement suit against Kirin, Medarex or any of their respective Affiliates during the Term of this Agreement alleging that the use of a Licensed Trademark or Collaboration Mouse, the Exploitation of a Collaboration Antibody, Collaboration Product or a method or process relating to the use and/or Exploitation of any of the foregoing, infringes one or more trademarks, patents or other intellectual property rights held by such Third Party. 1.263 "[*]" shall mean a [*] with which Medarex and Kirin enter into a [*] Agreement. 1.264 "[*]" shall mean an agreement entered into by Medarex and Kirin, on the one hand, and the [*], on the other hand, pursuant to Section 2.3.6 hereof. 1.265 "Trademark" shall include any word, name, symbol, color, designation, or device or any combination thereof, including any trademark, trade dress, service mark, service name, brand mark, trade name, brand name, logo, or business symbol. 1.266 "Transfer Agreement" shall mean a binding written agreement that effects a present transfer of significant commercial rights, including, without limitation, a research and development agreement or license agreement. For purposes of clarification, a Transfer Agreement shall not include a material transfer or an evaluation agreement, unless such agreement effects the present transfer of significant commercial rights. 1.267 "Valid Claim" shall mean, with respect to a particular country, a claim of an issued and unexpired patent in such country that (a) has not been revoked or held unenforceable or invalid by a decision of a court or governmental agency of competent jurisdiction from which no appeal can be taken or has been taken within the time allowed for appeal; (b) has not been abandoned, disclaimed, denied, or admitted to be invalid or unenforceable through reissue or disclaimer or otherwise in such country; and (c) is not within the Excluded Claims. ARTICLE II ANTIGEN AND ANTIBODY LISTS AND RELATED LISTING PROCEDURES AND DISCLOSURE REQUIREMENTS 2.1 Antibody Sequence List and Antigen Lists Maintained by Each Party. 2.1.1 By Medarex. Medarex shall establish and maintain during the Term and in accordance with Section 2.3 hereof the following three (3) lists, collectively referred to as the "Medarex Lists": (i) Medarex Restricted Antigen List, (ii) Medarex Non-Exclusive Antigen List, and (iii) Antibody Sequence List. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -32-


 Medarex shall also establish and maintain the Shared Exclusive Antigen List. Kirin shall assist Medarex in establishing and maintaining the Shared Exclusive Antigen List and the Antibody Sequence List by providing to Medarex the written notices required pursuant to Section 2.3.2(a)(ii) hereof. 2.1.2 By Kirin. Kirin shall establish and maintain during the Term and in accordance with Section 2.3 hereof the Kirin Non-Exclusive Antigen List. 2.2 In-House Target Lists and Medarex Internal Project List. 2.2.1 In House Targets. For purposes of Article V hereof, each Party shall prepare and maintain during the Term an In-House Target List at all times in current form, and provide to the other Party a true, correct and complete copy thereof within [*] business days after the Effective Date, and revised versions thereof [*] in which any amendment or other change is made thereto, including the addition or removal of any Target therefrom in accordance with Article V hereof. 2.2.2 Medarex Internal Project List. Medarex shall establish and provide to Kirin a Medarex Internal Project List within [*] business days after the Effective Date, and shall provide to Kirin during the Term an update to the list [*] in which any amendment or other change is made thereto. 2.3 Listing Procedures. With respect to each list that a Party is required to establish and maintain pursuant to Section 2.1.1 or 2.1.2 hereof, as applicable, the Party shall implement and comply with the following procedures: 2.3.1 Description of Antigens and Antibodies. (a) Antigens. In the event that a Party lists an Antigen in an Antigen List, an In-House List, or, in the case of Medarex, the Medarex Internal Project List, the listing Party shall comply with the following listing requirements, as applicable: (i) For purposes of a listing by Medarex in the Shared Exclusive Antigen List of any Antigen with respect to which Kirin (on behalf of itself, an Affiliate, Partner or In-House Collaborator) has exercised rights under a Kirin Exclusive Commercial License or a Kirin Semi-Exclusive Commercial License, Medarex shall describe each such Antigen [*] contained in the [*] delivered [*], as such information is more fully described in Section [*] hereof. (ii) For purposes of a listing by Medarex in the Medarex Restricted Antigen List, Medarex Non-Exclusive Antigen List and Shared Exclusive Antigen List of any Antigen with respect to which rights have been granted by Medarex to a Third Party (other than any of Kirin's In-House Collaborators or Partners), each Antigen shall be described [*], which description shall include the following information to the extent that such information is [*] to the Third Party and [*] such Third Party to Medarex at the time that such Third Party provides to Medarex a written inquiry regarding the availability of such Antigen: the Antigen's [*], other [*], the [*], equivalent [*] from other [*], and the [*] and/or the [*] therefor; provided, however, that if there is [*] or equivalent [*] from other [*] with respect to such Antigen, such Antigen shall be described by its [*] and/or [*]. (iii) For purposes of a listing by Medarex on the Medarex Exclusive Antigen List, Shared Exclusive Antigen List, or Medarex Non-Exclusive Antigen List on behalf of Medarex or a Medarex Affiliate, and for purposes of a listing by Kirin on the Kirin Non-Exclusive Antigen List on behalf of Kirin or a Kirin Affiliate, and for purposes of each Party's listings in its In-House Target List (and, in the case of Medarex, the Medarex Internal Project List), each Antigen shall be [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -33-


 described [*], which description shall include the following information to the extent that such information is [*] to the listing Party at the time of the listing with respect to such Antigen: the Antigen's [*], other [*], the [*], equivalent [*] from other [*], and the [*] and/or the [*] therefor; provided, however, that if there is [*] or equivalent [*] from other [*] with respect to such Antigen, such Antigen shall be described by its [*] and/or [*]. The Party adding an Antigen to an Antigen List, In-House Target List or Medarex Internal Project List shall indicate on the list the [*] such Antigen is added to such list and, where applicable, the [*] that [*] with respect to such Antigen [*] by such Party or [*] to the other Party, or an Affiliate of either Party, or a Third Party, as the case may be, whether such Antigen is a [*], and the [*] in which any [*] to such Antigen are [*]. (b) Antibodies. For purposes of the Antibody Sequence List, each Antibody shall be identified by reference to the Antibody Amino Acid Sequence. Medarex shall indicate on such list the date each such Antibody is added to such list, the date that rights with respect to each such Antibody were exercised by Medarex or granted to Kirin, an Affiliate of either Party, or a Third Party, as the case may be, and the respective territory(ies) in which any rights to such Antibody are held or granted. (c) Coding System. (i) [*] than [*] days [*] the Effective Date and during the remainder of the Term, Medarex shall implement and use the Coding System to assign codes to all Antigens and Antibodies listed on the Medarex Lists, Shared Exclusive Antigen List, Medarex In-House Project List and Medarex Internal Project List and thereafter during the Term shall use the Coding System for purposes of (i) responding to Antigen Availability Inquiries pursuant to Section 3.3.1(c) hereof, and (ii) responding to Antibody Availability Inquiries pursuant to Section 3.5.1 hereof. (ii) From and after the earlier of (A) the date of implementation of the Coding System by Medarex, or (B) the [*] day of the [*] day period provided in Section 2.3.1(c)(i) hereof, the code assigned by Medarex to each Antigen and Antibody hereunder in connection with the Coding System shall (a) be set forth in any written notice relating to such Antigen or Antibody required to be provided by Medarex to Kirin pursuant to this Agreement, and (b) remain on the applicable List in reference to such Antigen or Antibody and not be changed by Medarex unless Medarex provides to Kirin prior written notice of such change. 2.3.2 Additions of Antibodies and Antigens to Lists. (a) Antibodies and Antigens Selected Prior to the Effective Date. (i) With respect to each Antibody and each Antigen that Medarex has selected prior to the Effective Date for Medarex's internal use, or as to which Medarex has granted a Third Party the right to use any Collaboration Mice, including, without limitation, the Medarex Mice, Medarex shall include such Antibody on the Antibody Sequence List and shall include such Antigen on either the Medarex Restricted Antigen List, Shared Exclusive Antigen List, or the Medarex Non-Exclusive Antigen List, as appropriate, within [*] business days after the Effective Date in accordance with Section 2.3.1 hereof; provided, however, that in the case of any such Antibody, if Medarex has, prior to the Effective Date, entered into an agreement with a Third Party granting a license or other rights to one or more such Antibodies with affinity for one or more Antigens, but such Third Party has not, as of the Effective Date, disclosed to Medarex the identity of Antibodies with respect to which such Third Party has or will exercise rights under such agreement, Medarex shall include such Antibodies on the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -34-


 Antibody Sequence List within [*] business days after any subsequent written disclosure of any such Antibodies by such Third Party to Medarex; provided, further, that (1) with respect to any Antigen [*] shall have, at the time of such listing, (A) [*] with respect to such Antigen, or (B) a [*] with respect to such Antigen [*]; and (2) with respect to any Antigen listed [*] on the Shared Exclusive Antigen List [*], or on either the Shared Exclusive Antigen List or the Medarex Restricted Antigen List [*] shall (A) have, at the time of such listing, [*] with respect to such Antigen, or (B) [*] with respect to such Antigen within [*] days after including such Antigen on either the Medarex Restricted Antigen List or the Shared Exclusive Antigen List, as the case may be. (ii) With respect to each Antibody and each Antigen that Kirin has selected prior to the Effective Date, in reliance on the Agreement for Essential Terms for Collaboration, for the exercise or grant of a license or other rights related to any Collaboration Mice, Kirin shall, within [*] business days after the Effective Date, provide written notice to Medarex identifying such Antibody(ies) and such Antigen(s) and designate (A) each such Antibody Kirin has selected in connection with an In-House Project; (B) each such Antibody Kirin has selected for the grant of a license or other rights to a Kirin Affiliate or Kirin Partner; (C) each such Antigen Kirin has selected in connection with an In-House Project; and (D) each such Antigen Kirin has selected for the grant of a license or other rights to a Kirin Affiliate or Kirin Partner. Kirin shall indicate with respect to each such Antibody and Antigen the date on which rights with respect to such Antibody or Antigen were exercised or granted, as the case may be. Within [*] business days after the receipt of any such notice(s), Medarex shall include any and all such Antibodies on the Antibody Sequence List and shall include any and all such Antigens on the Shared Exclusive Antigen List pursuant to Section 2.3.1 hereof (indicating with respect to each such Antigen that it is a ROFR Target); provided, however, that if Kirin exercises a Kirin Non-Exclusive Commercial License with respect to any such ROFR Target pursuant to Section 4.3.4 hereof, or if Kirin declines to exercise a Commercial License but elects to retain a Reservation License with respect to such Antigen pursuant to Section 4.3.3(e)(ii) hereof, it shall be removed by Medarex from the Shared Exclusive Antigen List and added by Kirin to the Kirin Non-Exclusive Antigen List, and if Kirin otherwise declines or fails to exercise a Commercial License with respect to any such ROFR Target pursuant to Section 4.3.3(e) or 4.3.4 hereof, such Antigen shall be removed by Medarex from the Shared Exclusive Antigen List. (b) Antibodies and Antigens Selected On or After the Effective Date. (i) With respect to each Antigen (A) that Medarex selects on or after the Effective Date pursuant to Section 4.1 hereof, including, without limitation, in connection with a HuMAb Project, or (B) for which Medarex, on or after the Effective Date, exercises its rights under a Reservation License pursuant to Section 4.2.2 hereof or a Commercial License pursuant to Section 4.3 hereof, Medarex shall include such Antigen on either the Medarex Restricted Antigen List, Shared Exclusive Antigen List, or Medarex Non-Exclusive Antigen List, as appropriate, within [*] business days after the date on which Medarex (y) selects such Antigen pursuant to Section 4.1 hereof, or (z) exercises its rights under a Reservation License or Commercial License with respect to such Antigen, as the case may be; provided, however, that (1) with respect to any Antigen [*] shall have, at the time of such listing, (A) [*] with respect to such Antigen, or (B) a [*] with respect to such Antigen [*]; and (2) with respect to any Antigen listed [*] on the Shared Exclusive Antigen List [*], or on either the Shared Exclusive Antigen List or the Medarex Restricted Antigen List [*] shall (A) have, at the time of such listing, [*] with respect to such Antigen, or (B) [*] with respect to such Antigen within [*] days after including such Antigen on either the Medarex Restricted Antigen List or the Shared Exclusive Antigen List, as the case may be. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -35-


 (ii) With respect to each Antigen for which Kirin is deemed to have exercised its rights under a Reservation License pursuant to Section 4.2.3 hereof or a Commercial License pursuant to Section 4.3 hereof, within [*] business days after Kirin's exercise of such rights, Medarex shall include such Antigen for which Kirin has exercised its rights under an Antigen Exclusive Commercial License, or an Antigen Semi-Exclusive Commercial License (or a Reservation License in the case of any Antigen that is a ROFR Target) on the Shared Exclusive Antigen List. Within [*] business days after the exercise of its rights under a Reservation License (except in the case of an Antigen that is a ROFR Target) or Antigen Non-Exclusive Commercial License, Kirin shall include such Antigen on the Kirin Non-Exclusive Antigen List. (iii) With respect to each Antibody (A) that Medarex selects on or after the Effective Date pursuant to Section 4.1 hereof, including, without limitation, in connection with a HuMAb Project, (B) that Medarex, on or after the Effective Date, [*] pursuant to Section 4.4.2(a) or 4.4.2(c) hereof, or (C) that Kirin, on or after the Effective Date, [*] pursuant to Section 4.4.2(b) or 4.4.2(c) hereof, Medarex shall include such Antibody on the Antibody Sequence List within [*] business days after the date on which (x) Medarex selects such Antibody pursuant to Section 4.1 hereof, (y) Medarex [*] such Antibody [*], or (z) Kirin is deemed to have [*] such Antibody [*], as the case may be; provided, however, that in the case of any such Antibodies, if Medarex has, [*] entered into an agreement with a Third Party granting a license or other rights to one or more such Antibodies with affinity for one or more Antigens, but such Third Party has not, as of the date such Antibody is selected by such Third Party, disclosed to Medarex the identity of Antibodies with respect to which such Third Party has or will exercise rights under such agreement, Medarex shall include such Antibodies on the Antibody Sequence List within [*] business days after any subsequent written disclosure of any such Antibodies by such Third Party to Medarex. 2.3.3 Removal of Antibodies and Antigens From Lists. (a) Antigens That Are the Subject of a License Granted Pursuant to this Agreement. With respect to any Antigen added to an Antigen List pursuant to Section 2.3.2 hereof, the Party that maintains such list shall, within [*] business days after the expiration or termination of the License relating to such Antigen, remove the reference to such Antigen from any relevant Antigen List; provided, however, that no such Antigen shall be removed from such Antigen List in the event that such Antigen is the subject of a Reservation License and the holder of such License exercises its rights under a Commercial License with respect to such Antigen pursuant to Section 4.3 hereof, in which case such Antigen shall be removed from such Antigen List upon the expiration or termination of the Commercial License; and provided further that no such Antigen shall be removed from such Antigen List in the event that at least one other non-exclusive license granted or exercised by a Party relating to such Antigen remains in effect (or in the event that Medarex has granted or exercised rights to such Antigen on a non-exclusive basis in connection with a HuMAb Project). (b) Antibodies That Are [*]. With respect to any Antibody that is [*] by Medarex or Kirin [*] pursuant to Section 4.4.2(a), 4.4.2(b) or 4.4.2(c) hereof, as applicable, Medarex shall remove such Antibody from the Antibody Sequence List within [*] business days after (i) any expiration or earlier termination of the Commercial License to which [*] relates, or (ii) the [*] with respect to such Antibody, in the case of an Antibody that is [*] a Party pursuant to Section 4.4.2(c) hereof. (c) Antigens and Antibodies That Are the Subject of a HuMAb Project. With respect to any Antibody and/or Antigen that is designated by Medarex pursuant to Section 4.1 hereof and included in the Antibody Sequence List or an Antigen List pursuant to Section 2.3.2(a)(i), 2.3.2(b)(i), or 2.3.2(b)(iii) hereof, Medarex shall remove from the Antibody Sequence List and the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -36-


 relevant Antigen List references to any such Antibody and/or Antigen (i) upon [*] any [*] Project, [*] Project or [*]; or (ii) upon the expiration or termination of a license or other rights granted to an Affiliate or Third Party with respect to such Antibody or Antigen; provided, however, that no such Antigen shall be removed from an Antigen List in the event that such Antigen, immediately upon such expiration or termination of such license, shall become the subject of another license or grant of rights to the holder of the earlier granted license or rights, or in the event that non-exclusive licenses relating to such Antigen shall remain in effect. In the event that Medarex, pursuant to Section 2.3.2(a)(i) or 2.3.2(b)(i) hereof, as applicable, adds an Antigen to the Shared Exclusive Antigen List in connection with a [*] Project, or to either the Shared Exclusive Antigen List or the Medarex Restricted Antigen List in connection with a [*] Project, if [*], Medarex shall remove such Antigen from the Medarex Restricted Antigen List or the Shared Exclusive Antigen List, as the case may be, and at its election, add such Antigen to the Medarex Non-Exclusive Antigen List [*] for itself or the Medarex Affiliate or to grant to such Third-Party collaborator [*] with respect to such Antigen [*], and unless and until such Antigen is later determined to be available for the exercise of such rights in accordance with Article III hereof. 2.3.4 Maintenance of Lists. In the keeping of the Medarex Lists and the Shared Exclusive Antigen List commencing no later than [*] business days [*] the Effective Date, Medarex shall utilize a data storage and processing system that incorporates (a) date stamping functionality, (b) security functionality, and (c) data integrity functionality (including means to account for and store the identities of users and the dates on which such users make any changes to data stored using such system), which system is more fully described on Exhibit I hereto. All such functionalities with regard to the database shall meet or exceed the functionalities described on Exhibit I hereto. In any event, each Party shall exercise no less than reasonable care in maintaining, updating, handling and storing the Lists, the In-House Target Lists and the Medarex Internal Project List (as updated from time to time) that such Party is required to maintain hereunder, and in handling and storing the copies of the Lists, the In-House Target Lists, and the Medarex Internal Project List provided by one Party to the other Party pursuant to this Agreement and will take reasonable steps to safeguard the confidentiality of such lists. 2.3.5 [*]. (a) [*] Agreement and [*]. Promptly following the Effective Date, the Parties agree to [*] and enter into the [*] Agreement with such Third Party. Beginning on the effective date of the [*] Agreement, Medarex shall, [*] pursuant to the terms and conditions of the [*] Agreement. In the event that the [*] Agreement is terminated for any reason prior to the termination or expiration of this Agreement, the Parties shall promptly [*], subject to the terms and conditions of the [*] Agreement. (b) [*] Under [*] Agreement. Kirin hereby covenants to Medarex that Kirin will not submit to the [*], pursuant to Section 1.6 of the [*] Agreement (each a [*]), unless the conditions set forth in this Agreement with respect to such [*] have been satisfied, including, in the case of a [*], the conditions of Section 2.6 hereof, and in the case of a [*], Sections 3.3.1(d) and 3.5.2 hereof. Kirin hereby further covenants to Medarex that Kirin will send to the [*] business day before the expiration of the Additional Antigen Inquiry Response Period provided for in Section 3.3.1(d)(i) hereof or the Additional Antibody Inquiry Response Period provided for in Section 3.5.2(a) hereof, as the case may be [*] business day before the expiration of the Original Antigen Inquiry Response Period (as defined in Section 3.3.1(d)(i) hereof) or the Original Antibody Inquiry Response Period (as defined in Section 3.5.2(a) hereof), if the expedited procedure described in the first sentence of Section 3.3.1(d)(ii) or 3.5.2(b) hereof, as the case may be, has been triggered), in the event that Medarex has not replied to the relevant Antigen Availability Inquiry or Antibody Availability Inquiry, as the case may be, prior to such time. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -37- 


 2.3.6 [*] (a) Initial [*] Agreement. Promptly following the Effective Date, the Parties shall cooperate in good faith to identify a mutually acceptable Third Party to serve as the [*] and enter into a [*] Agreement with such Third Party (which Third Party shall satisfy [*], including that the [*] be an [*]. Such [*] Agreement shall, at a minimum (and in addition to the notice requirements set forth in Sections 3.3.1(d)(i) and 3.5.2(a) hereof), provide that: (i) The [*] shall be engaged by both Parties [*] of Kirin and Medarex in order to [*] under the circumstances set forth in Sections 3.3.1(d) and 3.5.2 hereof; (ii) Medarex shall be obligated, promptly upon the [*], to [*] with regard to the use of [*], which [*] unless Medarex [*]; provided, however, that Medarex shall not have, and shall expressly disclaim in the [*] Agreement, any liability relating to such [*] made by the [*] on the basis of such [*]; (iii) The [*] shall have access to, and make use of, [*] set forth in Section 3.3.1(d) or Section 3.5.2 hereof; (iv) The [*] Agreement shall contain confidentiality provisions customary in the industry prohibiting the [*] from disclosing the [*] to Kirin or any other Person, except upon being compelled to do so by a Third Party through legal process; (v) The [*] Agreement may not be terminated except upon material breach by the [*] and/or mutual agreement of Kirin and Medarex. (b) [*] Form of [*] Agreement. Promptly after the Parties reach agreement on the initial [*] Agreement pursuant to Section 2.3.6(a) hereof, the Parties shall cooperate in good faith to agree upon an [*] form of agreement with a [*], for use only in the circumstances contemplated by Section 2.3.6(c)(ii) hereof. Such [*] form of agreement shall be substantially in the form of the [*] Agreement entered into by the Parties pursuant to Section 2.3.6(a) hereof, except that such [*] form of agreement shall: (i) be modified [*]; (ii) in the sole discretion of Medarex, provide that the [*] in accordance with the terms of such agreement; and (iii) provide that Medarex is a [*] under such agreement, with [*] the [*] performance of its obligations thereunder. From time to time during the Term, in the event that a Party [*] that [*] the [*] form of agreement initially adopted by the Parties pursuant to the first two sentences of this Section 2.3.6(b) are [*], such Party shall so inform the other Party and the Parties shall cooperate in good faith to agree upon [*] to the [*] form of agreement with a [*], provided that, except with respect to [*] to the terms relating to [*] by the Parties to the [*], any such [*] form shall be [*] form of agreement initially adopted by the Parties. (c) Subsequent [*] Agreements. (i) Medarex [*]. In the event of termination of the [*] Agreement, if Kirin desires to engage a [*] at a time when Medarex is [*], Kirin shall provide to Medarex written [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -38-


 notice thereof, which notice shall be delivered by internationally recognized courier to the recipients identified in Section 18.3.2 hereof. In such event, the [*] shall be [*], provided that the [*] shall satisfy the [*]. Promptly following the [*] Agreement with such Person in a form that is [*] initially executed by the Parties pursuant to Section 2.3.6(a) hereof, provided that any changes to the form initially executed by the Parties shall [*]. (ii) Medarex [*]. In the event of termination of the [*] Agreement, if Kirin desires to engage a [*] at a time when Medarex is [*], Kirin shall select a [*] that satisfies the [*] and provide to Medarex written notice that Kirin desires for Medarex to enter into a [*] Agreement with such Third Party, which notice shall be delivered by internationally recognized courier to the recipients identified in Section 18.3.2 hereof. As part of such notice, Kirin shall provide to Medarex for signature a [*] Agreement signed by Kirin and such [*], which agreement shall be in the form of [*] Agreement executed by Medarex and Kirin pursuant to Section 2.3.6(a) hereof. In the event that Medarex does not sign and return the [*] Agreement to Kirin within [*] days of receiving it from Kirin, Kirin shall provide to Medarex written notice of Medarex's failure to respond to Kirin's request that Medarex sign the [*] Agreement, which notice shall be delivered by internationally recognized courier to the recipients identified in Section 18.3.2 hereof and shall contain the following legend, printed in fourteen (14) point or larger font, capital letters and boldface type immediately below the recipients names and addresses: "IMPORTANT. SECOND NOTICE. REFER TO 2.3.6 OF THE MEDAREX-KIRIN AGREEMENT FOR CONSEQUENCES OF FAILURE TO RESPOND". As of the date on which such notice is received by Medarex, Medarex shall have an [*] business days to sign and return to Kirin the [*] Agreement. [*]. (d) Kirin Not Permitted to Access [*]. It is understood and agreed that nothing contained in this Agreement or the [*] Agreement shall permit Kirin to obtain access to the [*] or the information contained therein. 2.4 Disclosure of Certain Antigen Lists. Within [*] business days [*] the Effective Date, Medarex shall provide to Kirin a true, correct and complete copy of the Shared Exclusive Antigen List, and Kirin shall provide to Medarex a true, correct and complete copy of the Kirin Non-Exclusive Antigen List. In addition, from time to time during the Term of this Agreement, but [*] in which any amendment or other change is made thereto, each Party shall provide the other Party with true, correct and complete updated copies of such List(s), if any. If requested by Medarex, Kirin shall provide a true, correct and complete updated copy of the Kirin Non-Exclusive Antigen List as frequently as Medarex may reasonably require, but [*] business days, as necessary to enable [*]. It is understood and agreed that Medarex shall not be required to provide or otherwise disclose to Kirin the Medarex Restricted Antigen List, Medarex Non-Exclusive Antigen List, or Antibody Sequence List; provided, however, that Medarex shall maintain such lists in accordance with Section 2.3 hereof and Kirin shall be permitted to [*]. 2.5 Confidentiality of Antigen and Antibody Disclosures. The disclosure of any Antigen List pursuant to Section 2.4 hereof, any disclosure by a Party to the other Party of the identity of an Antibody or an Antigen in connection with this Agreement, and any information provided by one Party to the other Party in response to any availability inquiries made pursuant to Article III hereof shall be subject to the terms and conditions of Article XIII hereof. Each Party represents, warrants, and covenants to the other Party that it will [*] provided by one Party to the other Party in response to Antigen and Antibody-related inquires, and will [*] of such information. 2.6 Records Retention; [*]. 2.6.1 Record Retention. The Party with an obligation to establish and maintain any List(s) pursuant to Section 2.1.1 or 2.1.2 hereof and to make and/or respond to Antigen or Antibody [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -39-


 availability inquiries pursuant to Sections 3.2.1, 3.3.1, 3.4 or 3.5 hereof, shall during the Term of this Agreement and for a period of [*] years after its expiration or earlier termination keep records of Antibodies and Antigens added and removed from such List(s) and availability inquiries received and availability responses provided, and the dates of the foregoing, in sufficient detail to confirm the timeliness and accuracy of such entries, deletions and availability responses. 2.6.2 [*]. Upon the written request of the other Party and not more often than once every [*] months, the Party maintaining such List(s) and/or required to respond to availability inquiries by the other Party shall [*], to all of the records of the Party that relate to such List(s) and/or such inquiries as may be [*] thereof (including, as necessary, any information from any database or Lists maintained by such Party and other information maintained by such Party pursuant to Section 2.6.1 hereof). 2.6.3 [*] Records. If the [*] that the [*] Party [*] or otherwise [*] to [*] an [*] or [*] on such [*] an [*] or [*] from such [*], or [*] and/or [*] (any of the foregoing, a [*]), the [*] shall [*] that such a [*] and shall [*]. In the event that (a) the [*] (including the [*] thereof) to the [*] of the [*] (as defined below), and the [*] (including the [*] thereof) [*], or (b) if such [*] is not capable of cure and adversely affects the [*] Party, then in either event the [*] to enforce its rights hereunder. For purposes of this Section 2.6.3, [*] shall mean [*] days from the date on which the [*] Party receives from the [*], or in the event that the [*] (including the [*] thereof) cannot, despite [*], be [*] within such period, [*] days from the date on which the [*] Party receives from the [*] (provided that such [*] day period shall apply only in the event and for so long as the [*] Party continues to [*]). With respect to any [*] pursuant to this Section 2.6.3, (i) the Parties shall [*] and failing [*] within a [*], either Party may [*]; and (ii) upon the [*] Party's reasonable request, the [*] Party shall take reasonable further actions to [*] from arising in the future. 2.6.4 [*] Except as provided in this Section 2.6.4, the [*] Party shall treat all [*] in connection with such [*] as [*] of the [*] Party in accordance with [*] hereof. With respect to any [*] to the [*] Party by the [*] that [*], the [*] Party shall continue to [*] such [*] in accordance with [*] hereof and in addition shall [*] to [*] and [*] such information in the [*] and shall provide [*] such information [*] to its [*] and a [*] of [*] and only to the extent that such persons have [*] such information to [*] in [*] such [*] Party's rights hereunder. Notwithstanding the fact that information [*] Party pursuant to this Section 2.6 is [*], the [*] Party shall have a right to the extent [*] to [*] hereunder to [*] to it by the [*] arising under this Agreement concerning a [*] but shall in each instance [*] to [*] of such information, including by [*] to [*] and/or other [*] such information in any such [*]. The [*] Party shall cause the [*] to enter into a [*] with, and in a form reasonably acceptable to, the [*] Party and require the [*] to the [*] in connection with the [*]. ARTICLE III ANTIBODY AND ANTIGEN AVAILABILITY 3.1 Principles of Antibody and Antigen Availability. The Parties agree to comply with the principles of Antibody and Antigen availability set forth in this Article III in connection with responding to availability inquiries made by the other Party, and making any grant to Affiliates and/or Third Parties of, or exercising, rights in, to or under the Technology, KM Patent Rights and/or KM Know How and relating to any Collaboration Mice for use in the research, development and/or commercialization of Collaboration Antibodies and Collaboration Products, as contemplated in this Agreement. The Parties further agree that any and all investigations and conclusions made pursuant to this Article III with respect to the availability or unavailability of such Antigen and/or Antibody in response to an inquiry by the other Party, or for the grant to Affiliates and/or Third Parties, or the exercise by a Party, of rights shall (i) be [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -40-


 made [*], as [*], and (ii) be [*] basis as that concept is more fully described in the following Sections. The Parties acknowledge and agree that this Section 3.1 is meant to describe in general terms the principles for determining availability and that nothing in this Section 3.1 is intended to alter or override more specific provisions contained in this Agreement. 3.2 Medarex Antigen [*]. 3.2.1 Review Procedure. During the Term of this Agreement, in the event that Medarex desires to [*] of an Antigen [*], or [*] with which [*] in connection with [*] pursuant to Section 4.1 hereof, Medarex shall review (a) each of the Antigen Lists maintained by Medarex pursuant to Section 2.1.1 hereof, and, if Medarex desires to [*] of an Antigen on an [*] basis, the latest version of the [*] as provided to [*] pursuant to Section 2.4 hereof; and (b) any and all notices, inquiries and other [*] an Antigen that have been [*] as of the [*] at which [*] pursuant to clause (a) hereof but which Antigen(s) has [*] in accordance with Article II hereof. Prior to [*] with respect to such Antigen on an [*] basis, Medarex shall [*] that [*], and [*] within [*] business days after the receipt of such request, to enable Medarex to confirm whether there have been any [*] since a [*], and, if so, [*] to such list. 3.2.2 Available Antigens. (a) Unlimited Availability. An Antigen shall be available to Medarex for (i) the grant or exercise of rights pursuant to Section 4.1 hereof on an exclusive or non-exclusive basis, (ii) the exercise of its rights under a Reservation License pursuant to Section 4.2 hereof, or (iii) the exercise of its rights under a Commercial License pursuant to Section 4.3 hereof, if [*] with respect to an Antigen pursuant to Section 3.2.1 hereof or, if [*] with respect to such Antigen, (y) rights with respect to such Antigen [*], as confirmed by Medarex's review of the information on the then-current [*] and on the then-current [*], and (z) Medarex [*] indicating that [*] desires to exercise its rights under a License with respect to such Antigen. (b) Limited Availability. An Antigen shall be available to Medarex for the exercise of its rights (i) pursuant to Section 4.1 hereof [*] (e.g., on a [*], or subject to any [*] on a [*], (ii) under a [*] pursuant to Section [*] hereof, (iii) under an [*] pursuant to Section [*] hereof, or (iv) under an [*] pursuant to Section [*] hereof, if as of the [*] at which [*] pursuant to Section 3.2.1 hereof or, if the [*]y, as of the [*] at which [*] with respect to such Antigen, (y) rights with respect to such Antigen [*], as confirmed by information on the then-current [*] and on the then-current [*], and (z) Medarex [*] indicating that [*] desires to exercise its rights under a License with respect to such Antigen [*]. 3.2.3 Unavailable Antigens. An Antigen shall be unavailable to Medarex for the grant or exercise of rights pursuant to Article IV hereof if [*], or, in the case of an [*], (a) rights with respect to such Antigen [*], as confirmed by information on the then-current [*], or (b) Medarex [*] indicating that [*] desires to exercise its rights under a License with respect to such Antigen [*]. 3.2.4 Antigens Subject to ROFRs. Notwithstanding the foregoing, if as of the [*] of an availability inquiry by Medarex with respect to an Antigen pursuant to Section 3.2.1 hereof, such Antigen is a ROFR Target for which Refusal Rights are held by [*], as confirmed by Medarex's review of the information on the then-current [*] maintained by Medarex and Kirin, and the other information that Medarex is required to review pursuant to Section 3.2.1 hereof, then such Antigen shall be unavailable to Medarex for the [*] pursuant to Article [*] hereof [*] hereof, as applicable, are satisfied with respect to such Antigen. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -41-


 3.2.5 Medarex Right to Make [*] Inquiries. Subject to Section 3.7 hereof, Medarex shall be permitted during the Term of the Agreement to make [*] inquiries with respect to the availability of Antigens pursuant to Section 3.2.1 hereof, [*] to [*] or to otherwise [*] with respect to such Antigen(s) pursuant to Section [*] hereof. 3.3 Kirin Antigen Inquiries. 3.3.1 Inquiry Procedures. (a) Antigen Availability Inquires by Kirin. During the Term of this Agreement, in the event that Kirin desires, on behalf of itself, or any of its Affiliates, Partners or In-House Collaborators, to ascertain the availability of an Antigen, Kirin shall review the Kirin [*] List and shall make an Antigen Availability Inquiry to Medarex indicating in such inquiry whether it seeks to determine the availability of such Antigen on an exclusive, semi-exclusive, or non-exclusive basis. For the avoidance of doubt, as part of a [*] Kirin may inquire as to whether the Antigen [*]. (b) Review of Information by Medarex. In response to an Antigen Availability Inquiry, Medarex shall investigate whether and to what extent such Antigen is available by reviewing (i) each of the then-current [*] maintained by Medarex pursuant to Section 2.1.1 hereof and the Kirin [*] List, and (ii) any and all written notices, written inquiries and other written requests for rights with respect to an Antigen that have been received by Medarex from a Medarex Affiliate, Kirin or a Third Party [*] by Medarex of the subject Antigen Availability Inquiry from Kirin pursuant to Section 3.3.1(a) hereof but which Antigen(s) has not yet been added to the Lists maintained by Medarex in accordance with Article II hereof. (c) Medare x Response to Kirin. [*] after making an availability investigation in response to an Antigen Availability Inquiry from Kirin, but in no event [*] business days following receipt of such inquiry, Medarex shall inform Kirin whether the Antigen is available on the basis as to which Kirin has inquired, as determined in accordance with Sections 3.3.2, 3.3.3 and 3.3.4 hereof, and with respect to each Antigen that is unavailable to Kirin on the basis as to which Kirin has inquired, Medarex shall also disclose to Kirin the code assigned to such Antigen by Medarex in accordance with the Coding System at the time Medarex informs Kirin of the unavailability of such Antigen. In the event that Kirin desires to exercise an Antigen Exclusive Commercial License with respect to a particular Antigen and the Antigen is not available for the exercise of such a license, or in the event that Kirin desires to exercise an Antigen Semi-Exclusive Commercial License or an Antigen Non-Exclusive Commercial License with respect to a particular Antigen and the Antigen is not available for the exercise of either such license, then [*] shall [*] provide to [*] evidencing the [*] or [*] of [*] to such Antigen, subject to [*] to [*] the [*], information other than the information required to confirm such [*] or [*] of [*], and any other [*] of any such [*]. In the event that Kirin has inquired about the availability of an Antigen for the exercise of an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, and such Antigen is not available for an Antigen Exclusive Commercial License but is available for an Antigen Semi-Exclusive Commercial License, [*] shall [*] as to whether [*] than [*] has [*] with [*] to an [*] (but shall not be required to [*] the [*] of [*] which have such [*]). In the event that Kirin has inquired about the availability of an Antigen for the exercise of a License and such Antigen is not available because it is a ROFR Target, [*] shall [*], and except to the extent [*] to the [*] which holds the [*], as determined in [*] shall [*] of the steps required to [*] and the [*] such [*] has to [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -42-


 (d) Consequence of Medarex's Failure to Respond to Antigen Availability Inquiry. (i) In the event that Medarex does not respond to an Antigen Availability Inquiry within the applicable [*] business day period (with respect to each Antigen Availability Inquiry, the "Original Antigen Inquiry Response Period"), and Kirin continues to desire a response to such inquiry, Kirin shall provide to Medarex written notice of Medarex's failure to respond, which notice shall be delivered by an internationally recognized courier to the recipients identified in Section 18.3.2 hereof and shall contain the following legend, printed in fourteen (14) point or larger font, capital letters and boldface type immediately below the recipients' names and addresses: "IMPORTANT. SECOND NOTICE. REFER TO SECTION 3.3.1(d) OF THE MEDAREX-KIRIN AGREEMENT FOR CONSEQUENCES OF FAILURE TO RESPOND." Subject to Section 3.3.1(d)(ii) hereof, as of the date on which such notice is received by Medarex, Medarex shall have an [*] business day period to respond to the Antigen Availability Inquiry (with respect to each Antigen Availability Inquiry, the "Additional Antigen Inquiry Response Period"). In the event that [*] within the [*], Kirin shall have [*] the [*] pursuant to the terms of the [*]. Until such time as [*] shall deliver to Kirin written notice of [*] to Kirin for the exercise of the rights about which Kirin has inquired in the applicable Antigen Availability Inquiry in accordance with the terms of the [*] Agreement, the Antigen that is the subject of the Antigen Availability Inquiry shall be unavailable to Kirin for the exercise of such rights pursuant to Article IV hereof. The [*] Agreement shall require that, in the event that the [*], the [*] shall provide notice of that [*] to Kirin and shall provide a copy of such [*] to Medarex. For purposes of this Agreement, a [*], provided that such [*] is made in accordance with the terms and conditions of this Section 3.3.1(d) and the [*] Agreement. (ii) In the event Medarex does not respond [*] Antigen Availability Inquiries, in each case during the Original Antigen Inquiry Response Period and the Additional Antigen Inquiry Response Period, and Medarex's initial receipt of the first and the last of such Antigen Availability Inquiries is separated by at [*], Kirin shall have the right with respect to each subsequent Antigen Availability Inquiry for which Medarex fails to respond during the Original Antigen Inquiry Response Period [*] pursuant to Section 3.3.1(d)(i) hereof and the terms of the [*] Agreement (without waiting for the Additional Antigen Inquiry Response Period to lapse with respect to such inquiry). Notwithstanding the foregoing, in the event that, in response to subsequent Antigen Availability Inquiries from Kirin, Medarex responds to at least [*] Antigen Availability Inquiries, in each case during the Original Antigen Inquiry Response Period, and Medarex's initial receipt of the first and the last of such Antigen Availability Inquiries is separated by at [*] weeks, the provisions of the preceding sentence shall cease to apply until and unless Medarex again does not respond to [*] Antigen Availability Inquiries, in each case during the Original Antigen Inquiry Response Period and the Additional Antigen Inquiry Response Period, and Medarex's initial receipt of the first and the last of such Antigen Availability Inquiries is separated by [*] weeks, in which case the preceding sentence shall again apply. (iii) In the event that Medarex does not respond to an Antigen Availability Inquiry prior to the expiration of the Additional Antigen Inquiry Response Period with respect to such inquiry (or prior to the expiration of the Original Antigen Inquiry Response Period if the expedited procedure described in the first sentence of Section 3.3.1(d)(ii) hereof has been triggered), and as of the [*] of such period there is not a [*] Agreement in effect, [*]. 3.3.2 Available Antigens. (a) Unlimited Availability. An Antigen is available to Kirin for the exercise of its rights under (i) a Reservation License pursuant to Section 4.2 hereof, or (ii) any Commercial License [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -43-


 pursuant to Section 4.3 hereof, if [*] with respect to such Antigen pursuant to Section 3.3.1(a) hereof, (y) rights with respect to such Antigen [*], as confirmed by the information on the then-current [*] maintained [*] and on the then-current [*], and (z) Medarex [*] from any [*] or [*] with which [*] has [*] an [*] pursuant to which such [*] or [*] has [*] against which to [*], a [*] for a [*] or other [*] within the [*] of such [*] with respect to [*]. For the avoidance of doubt, in order for the [*] referred to in [*] to render an Antigen [*], under the terms of the [*], such [*] thereto must [*] the [*] or [*] with respect to such Antigen within [*] business days from the date on which Medarex notifies [*]; provided, however, that with respect to [*], the [*] shall have [*] as may be permitted under [*] to obtain or exercise such rights. (b) Limited Availability. An Antigen shall be available to Kirin for the exercise of its rights under (i) a Reservation License pursuant to Section 4.2 hereof, (ii) an Antigen Semi-Exclusive Commercial License pursuant to Section 4.3 hereof, or (iii) an Antigen Non-Exclusive Commercial License pursuant to Section 4.3 hereof, if [*] with respect to such Antigen pursuant to Section 3.3.1(a) hereof, (y) rights with respect to such Antigen [*], as confirmed by information on the then-current [*], and (z) Medarex [*] from any [*] or [*] with which [*] has [*] an [*] pursuant to which such [*] or [*] has [*] against which to [*], a [*] for a [*] or other [*] within the [*] of such [*] with respect to such [*] on an [*] basis. For the avoidance of doubt, in order for the [*] to render an Antigen unavailable to any extent, under the terms of the [*], such [*] thereto must [*] of the [*] or [*] with respect to such Antigen within [*] business days from the date on which Medarex notifies [*]; provided, however, that with respect to [*], the [*] shall have [*] as may be permitted under [*] to obtain or exercise such rights. 3.3.3 Unavailable Antigens. An Antigen shall be unavailable to Kirin for the grant or exercise of rights pursuant to Article IV hereof if [*] with respect to such Antigen pursuant to Section 3.3.1(a) hereof, (a) rights with respect to such Antigen [*], as confirmed by information on the then-current [*], or (b) Medarex [*]. For the avoidance of doubt, in order for [*] to render an Antigen unavailable to any extent, under the terms of the [*], such [*] with respect to such Antigen within [*] business days from the date on which Medarex notifies [*]; provided, however, that with respect to [*], the [*] with which Medarex has entered into [*] shall have [*] as may be permitted under [*] to obtain or exercise such rights. 3.3.4 Antigens Subject to ROFRs. Notwithstanding the foregoing, if [*] with respect to an Antigen pursuant to Section 3.3.1(a) hereof, such Antigen has become a ROFR Target for which Refusal Rights are held by [*], as confirmed by Medarex's review of the information on the [*] maintained by Medarex and Kirin, and the other information that Medarex is required to investigate pursuant to Section 3.3.1(b) hereof, then such Antigen shall be unavailable to Kirin for the exercise of rights under Article IV hereof unless and until the requirements of Section 4.3.4(d) or (e) hereof, as applicable, are satisfied with respect to such Antigen. 3.3.5 Kirin Right to Make [*] Inquiries. Subject to Section 3.7 hereof, Kirin shall be permitted during the Term of the Agreement to make [*] Antigen Availability Inquiries pursuant to Section 3.3.1(a) hereof, [*] to obtain a Reservation License or a Commercial License. 3.4 Medarex Antibody Inquiries. 3.4.1 Review Procedures. During the Term of this Agreement, in the event that Medarex desires to ascertain the availability of an Antibody on behalf of itself, any of its Affiliates, Partners, In-House Collaborators or other Third Parties with which it enters into a Project Agreement in connection with one or more HuMAb Projects pursuant to Section 4.1 hereof, Medarex shall review [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -44-


 (i) the [*] (which, in the case of any [*], shall be reviewed to identify whether [*] with respect to the Antigen against which such Antibody was raised), and (ii) any and all written notices, written inquiries and other written requests for rights with respect to an Antibody and/or Antigen-exclusive or Antigen-semi-exclusive rights with respect to an [*] pursuant to this Section 3.4.1 but which Antibody(ies) and/or Antigen(s) have not yet been added to the [*] in accordance with Article II hereof. 3.4.2 Available Antibodies. An Antibody shall be available to Medarex for the grant or exercise of rights pursuant to Sections 4.1 and 4.4 hereof if, [*] pursuant to Section 3.4.1 hereof or, if [*] with respect to such Antibody, (i) such Antibody [*] List, and the Antigen against which such Antibody was raised and for which such Antibody has affinity [*]; and (ii) Medarex [*] pursuant to Section 4.4.2(b) or 4.4.2(c) hereof indicating that [*] desires to [*] such Antibody [*] or [*] pursuant to Section 4.3 hereof indicating that [*] desires to exercise an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License with respect to the Antigen against which such Antibody was raised. 3.4.3 Unavailable Antibodies. An Antibody shall be unavailable to Medarex for the grant or exercise of rights pursuant to Section 4.1 or 4.4 hereof, if, [*] pursuant to Section 3.4.1 hereof or, if [*], (i) such Antibody has been listed on the then-current [*], or the Antigen against which such Antibody was raised, and for which such Antibody has affinity [*]; or (ii) Medarex has received from Kirin [*] to Section 4.4.2(b) or 4.4.2(c) hereof indicating that [*] desires to [*] such Antibody [*] or a [*] pursuant to Section 4.3 hereof indicating that [*] desires to exercise an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License with respect to the Antigen against which the Antibody was raised and for which such Antibody has affinity. Such Antibody shall continue to be unavailable to Medarex unless and until such Antibody is later determined to be available in connection with a subsequent Antibody review. Subject to Section 3.7 hereof, there shall be [*] Antibody inquiries that Medarex can make without [*] pursuant to Section 4.4 hereof or otherwise [*] with respect to such Antibody pursuant to Section 4.1 hereof. 3.5 Kirin Antibody Inquiries. 3.5.1 Inquiry Procedures. During the Term of this Agreement, in the event that Kirin desires to ascertain the availability of an Antibody on behalf of itself, any of its Affiliates, Partners, or In-House Collaborators, Kirin shall provide an Antibody Availability Inquiry to Medarex. With respect to an Antibody Availability Inquiry for an Antibody raised against and with affinity for a Kirin Reservation Target, Kirin Exclusive Commercial Target, Kirin Non-Exclusive Commercial Target, or Kirin Semi-Exclusive Commercial Target, within [*] business days following receipt of such inquiry from Kirin, Medarex shall (i) review the then current [*] and any and all [*] and other [*] for [*] that have been [*] from a [*] or [*] as of the [*] of [*] from [*] of such [*] pursuant to this Section 3.5.1 but which Antibody(ies) has not yet been added to the [*] List in accordance with Article II hereof, and (ii) inform Kirin whether the Antibody is available. With respect to an Antibody Availability Inquiry for an Antibody raised against and with affinity for an Antigen, other than an Antigen that is a Kirin Reservation Target or a Kirin Commercial Target, within [*] business days following receipt of such inquiry from Kirin, Medarex shall (i) review the then-current [*] (which, in the case of any [*], shall be [*] whether any [*] (other than the [*] the [*] is [*]) has [*] or [*] or [*] with respect to [*], and any and all [*] and other [*] for [*] with respect to an [*] and/or [*] or [*] with respect to an [*] that have been [*] from a [*] or [*] as of the [*] of [*] from [*] of such [*] pursuant to this Section 3.5.1 but which Antibody(ies) and/or Antigen(s) have not yet been added to the [*] or [*] in accordance with Article II hereof, and (ii) inform Kirin whether the Antibody is available. With respect to each Antibody that is unavailable to Kirin as determined in accordance with Section 3.5.4 hereof, Medarex shall also disclose to Kirin the code assigned by Medarex to such Antibody (and the code assigned to the Antigen against which such [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -45-


 Antibody was raised) in accordance with the Coding System at the time Medarex informs Kirin of the unavailability of such Antibody. In the event that such Antibody is not available, [*] shall [*] to [*] evidencing the [*] or [*] of [*] to such Antibody, subject to [*] to [*] the [*] of any [*] or [*], information other than the information [*] such [*] or [*] of [*], and any other [*] of any [*] or [*]. 3.5.2 Consequence of Medarex's Failure to Respond to Antibody Availability Inquiry. (a) In the event that Medarex does not respond to an Antibody Availability Inquiry within the applicable [*] business day period (as provided in Section 3.5 hereof) (with respect to each Antibody Availability Inquiry, the "Original Antibody Inquiry Response Period"), and Kirin continues to desire a response to such inquiry, Kirin shall provide to Medarex written notice of Medarex's failure to respond, which notice shall be delivered by an internationally recognized courier to the recipient identified in Section 18.3.2 hereof and shall contain the following legend, printed in fourteen (14) point or larger font, capital letters and boldface type immediately below the recipients' names and addresses: "IMPORTANT. SECOND NOTICE. REFER TO SECTION 3.5.2 OF THE MEDAREX-KIRIN AGREEMENT FOR CONSEQUENCES OF FAILURE TO RESPOND". Subject to Section 3.5.2(b) hereof, as of the date on which such notice is received by Medarex, Medarex shall have an [*] business day period to respond to the Antibody Availability Inquiry, in any case where the Original Antibody Inquiry Response Period was [*] business days, and an [*] business day period to respond to the Antibody Availability Inquiry, in any case where the Original Antibody Inquiry Response Period was [*] business days (with respect to each Antibody Availability Inquiry, the "Additional Antibody Inquiry Response Period"). In the event that [*] within [*] shall have the [*] pursuant to the [*] of the [*] Until such time as the [*] shall deliver to Kirin written notice of [*] in accordance with the terms of the [*] Agreement, the Antibody that is the subject of the Antibody Availability Inquiry shall be unavailable to Kirin for the exercise of such rights pursuant to Article IV hereof. The [*] Agreement shall require that, in the event that the [*], the [*] shall provide notice of that [*] to Kirin and shall provide a copy of such [*] to Medarex. For purposes of this Agreement, a [*], provided that such [*] is made in accordance with the terms and conditions of this Section 3.5.2 and the [*] Agreement. (b) In the event that Medarex does not respond to [*] Antibody Availability Inquiries, in each case during the Original Antibody Inquiry Response Period and the Additional Antibody Inquiry Response Period, and Medarex's initial receipt of the first and the last of such Antibody Availability Inquiries is [*], Kirin shall have the right with respect to each subsequent Antibody Availability Inquiry for which Medarex fails to respond during the Original Antibody Inquiry Response Period to have [*] pursuant to Section 3.5.2(a) hereof and the terms of the [*] Agreement (without waiting for the Additional Antibody Inquiry Response Period to lapse with respect to such inquiry). Notwithstanding the foregoing, in the event that, in response to subsequent Antibody Availability Inquiries from Kirin, Medarex responds to [*] Antibody Availability Inquiries, in each case during the Original Antibody Inquiry Response Period, and Medarex's initial receipt of the first and last of such Antibody Availability Inquiries is [*], the provisions of the preceding sentence shall cease to apply until and unless Medarex again does not respond to [*] Antibody Availability Inquiries, in each case during the Original Antibody Inquiry Response Period and the Additional Antibody Inquiry Response Period, and Medarex's initial receipt of the first and last of such Antibody Availability Inquiries is [*] weeks, in which case the preceding sentence shall again apply. (c) In the event that Medarex does not respond to an Antibody Availability Inquiry prior to the expiration of the Additional Antibody Inquiry Response Period with respect to such inquiry (or prior to the expiration of the Original Antibody Inquiry Response Period if the expedited [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -46-


 procedure described in the first sentence of Section 3.5.2(b) hereof has been triggered), and as of the [*] of such period there is not a [*] Agreement in effect, [*]. 3.5.3 Available Antibodies. An Antibody shall be available to Kirin for the grant or exercise of rights pursuant to Section 4.4 hereof if [*] (i) such Antibody [*], and the Antigen against which such Antibody was raised [*], and (ii) [*]. For the avoidance of doubt, in order for the [*] to render an Antibody unavailable, under the terms of the [*], such [*] with respect to such Antibody [*] business days from the date on which Medarex notifies [*]; provided, however, that with respect to [*], the [*] shall have [*] as may be permitted under [*] to obtain or exercise such rights. 3.5.4 Unavailable Antibodies. An Antibody shall be unavailable to Kirin for the exercise of rights pursuant to Section 4.4 hereof if [*] (i) such Antibody [*], or the Antigen against which such Antibody was raised [*], or (ii) Medarex [*]. Such Antibody shall continue to remain unavailable to Kirin unless and until such Antibody is later determined to be available in connection with a subsequent Antibody Availability Inquiry. Subject to Section 3.7 hereof, there shall be [*] Antibody Availability Inquiries that Kirin can make to Medarex, [*] to include any such Antibody [*] pursuant to Section 4.4 hereof. For the avoidance of doubt, in order for [*] to render an Antibody unavailable, under the terms of the [*], such [*] with respect to such Antibody within [*] business days from the date on which Medarex notifies [*]; provided, however, that with respect to [*], the [*] with which Medarex has entered into [*] shall have [*] as may be permitted under [*] to obtain or exercise such rights. 3.6 Notices, Inquiries and Other Requests Relating to Antibodies and Antigens. In order to ensure accurate determinations by Medarex with respect to the priority of receipt of any notices, inquiries, and other requests from Kirin, Medarex Affiliates and Third Parties for rights with respect to Antigens and Antibodies, Medarex shall [*] in documenting and maintaining such notices, inquiries and other requests, [*]. For purposes of this Article III and Article IV hereof, notices, inquiries and other requests for rights relating to Antibodies and Antigens that are provided to Medarex by Kirin, any Medarex Affiliates or Third Parties, shall be deemed to be "received" by Medarex on the date and time at which the notice, inquiry or request is actually received in writing by Medarex (which in the case of notices, inquiries and requests made by Kirin shall comply with Section 18.3.3 hereof), except to the extent that the terms of any applicable agreement entered into between Medarex and a Third Party prior to the Effective Date provide that the notice, inquiry, or request shall be deemed made by such Third Party and/or deemed received by Medarex on a different date (which date shall not be more than [*] days prior to the date of actual receipt of such notice), in which case the date for determining priority with respect to Antigen or Antibody availability shall be determined in accordance with the terms of such agreement. Unless otherwise expressly indicated, "written", when referring to any notice, inquiry or request under this Article III, include writings on paper, delivered by mail, courier, facsimile or otherwise, as well as electronic transmissions (e.g., via email). 3.7 Covenants Relating to Lists and Disclosures. Medarex covenants that it will not use the information contained in the Lists or the information disclosed by Kirin to Medarex in accordance with Sections 6.5.1 or 6.5.2 hereof, or otherwise make availability inquiries pursuant to Section 3.2.1 or 3.4,1 hereof, for the purpose of identifying Antigens or Antibodies for Exploitation by Medarex or any of its Affiliates, Partners, In-House Collaborators, or Third Parties with which Medarex enters into a Project Agreement in connection with one or more HuMAb Projects pursuant to Section 4.1 hereof. Kirin covenants that it will not use the information contained in the Lists, the information disclosed by Medarex to Kirin in response to Antigen Availability Inquiries or Antibody Availability Inquiries, or the information disclosed by Medarex to Kirin in accordance with Sections 6.5.1 or 6.5.2 hereof, or otherwise make inquiries to Medarex pursuant to Section 3.3.1(a) or 3.5.1 hereof, for the purpose of identifying Antigens or Antibodies for Exploitation by Kirin or any of its Affiliates, Partners, or In-House [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -47- 


 Collaborators. For the avoidance of doubt, once a Party, without reference to the Lists or the other Antigen or Antibody-related information disclosed by a Party to the other Party pursuant to this Article III hereof, has identified an Antigen or an Antibody as a possible candidate for Exploitation, it may use the information contained in the Lists for the purpose of determining whether it is permitted, pursuant to the terms of this Agreement, to proceed with the Exploitation of such Antibody or Antigen, as the case may be. 3.8 Purchase of Rights. Subject to all the other terms and conditions of this Agreement, including restrictions on sublicensing contained in Article VIII hereof, nothing set forth in Sections 3.2.3, 3.3.3, 3.4.3 or 3.5.4 hereof is intended to limit either Party's right to independently purchase or in-license rights from any Person. ARTICLE IV ANTIGEN AND ANTIBODY SELECTION FOR EXERCISE OF LICENSE RIGHTS 4.1 Projects Involving Use of Medarex Mice and/or Medarex Technology. In the event and to the extent that an Antigen is available pursuant to Section 3.2.2(a) or 3.2.2(b) hereof, or that an Antibody is available pursuant to Section 3.4.2 hereof, in addition to Medarex's rights under Sections 4.2, 4.3, and 4.4 hereof, during the Term of this Agreement Medarex retains and shall have the right to use the Medarex Technology and Medarex Mice, and/or to grant to one or more Medarex Affiliates or Third Parties rights to use the Medarex Technology and/or Medarex Mice, in connection with the research, development and/or commercialization of any such Antigen or any such Antibody selected by Medarex pursuant to this Section 4.1 and/or Antibody Products containing any such Antibody (and Antibody Material related thereto), including, without limitation, in connection with a HuMAb Project; provided, however, that Medarex shall add such Antigen or Antibody on either the Medarex Restricted Antigen List, Shared Exclusive Antigen List, Medarex Non-Exclusive Antigen List or Antibody Sequence List, as appropriate, pursuant to Section 2.3.2(b)(i) or 2.3.2(b)(iii), as applicable, and using the Coding System. Subject to the availability of an Antigen on an exclusive basis as determined in accordance with Section 3.2.2(a) hereof, if Medarex (on behalf of itself, a Medarex Affiliate, or Third Party) selects such Antigen for a HuMAb Project, or otherwise elects to exercise, or grant to one or more Medarex Affiliates or Third Parties, rights to use the Medarex Technology and/or Medarex Mice to Exploit Antibodies (and/or Antibody Products) against an Antigen as contemplated herein on an Antigen-exclusive basis pursuant to this Section 4.1, it shall pay to Kirin the applicable Antigen Exclusivity Fee pursuant to Section 10.4.3 hereof, if any, within [*] days after such exercise or grant, as the case may be. 4.2 Reservation Licenses. 4.2.1 In General. Subject to the availability of an Antigen as determined in accordance with Article III hereof, each Party may exercise its rights under a Reservation License with respect to such Antigen on behalf of itself, or with the intent of granting a sublicense under such Reservation License, as follows. 4.2.2 Exercise by Medarex of a Reservation License. In the event that Medarex desires to exercise its rights under a Reservation License with respect to an Antigen and such Antigen is available to Medarex for the exercise of such rights pursuant to the terms and conditions of Section 3.2.2 hereof, Medarex shall provide notice to Kirin pursuant to this Section 4.2.2 and indicate that it is exercising its rights under a Reservation License (which notice need not identify the Antigen for which the rights are being exercised (except in the case of In-House Projects, in which case Medarex shall disclose the identity of the Antigen(s) to Kirin on Medarex's In-House Project List), but shall in any event [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -48-


 identify the code assigned by Medarex to such Antigen pursuant to the Coding System). With respect to each Antigen for which Medarex exercises its rights under a Reservation License, Medarex shall (a) add such Antigen to the Medarex Non-Exclusive Antigen List (or, if such Antigen is a ROFR Target, Medarex shall add such Antigen to the Shared Exclusive Antigen List or the Medarex Restricted Antigen List, as the case may be) pursuant to Section 2.3.2(b)(i) hereof, and (b) pay to Kirin the Reservation License Fee, if any, pursuant to Section 10.2 hereof. 4.2.3 Exercise by Kirin of a Reservation License. In the event that Kirin desires to exercise its rights under a Reservation License with respect to an Antigen, it shall make an Antigen Availability Inquiry to Medarex in accordance with the terms of Section 3.3.1(a) hereof, and as part of such inquiry shall notify Medarex that Kirin desires to exercise its rights under a Reservation License with respect to the Antigen that is the subject of the inquiry (and whether, if available for the exercise of such a License, upon such exercise by Kirin such Antigen would be a ROFR Target for which Refusal Rights are held by a Third Party). Within the time in which Medarex is required to respond to such Antigen Availability Inquiry pursuant to Section 3.3.1(c) hereof, Medarex shall inform Kirin whether Kirin may exercise its rights under a Reservation License with respect to such Antigen, i.e., whether rights with respect to such Antigen are available on a non-exclusive basis (or, if such Antigen upon such exercise by Kirin would be a ROFR Target, whether rights are available on an exclusive basis, pursuant to Section 3.3.2(a) hereof). In the event that Medarex notifies Kirin in writing that such Antigen is available to Kirin for the exercise of its rights under such Reservation License, Kirin shall be deemed to have exercised its rights under a Reservation License for such Antigen as of the date on which Medarex provides such notice to Kirin. In the event that Medarex indicates that the Antigen is not available to Kirin for the exercise of rights under a Reservation License with respect to such Antigen, Kirin may not exercise its rights under such Reservation License with respect to such Antigen, unless and until it determines that such Antigen is available pursuant to a subsequent Antigen Availability Inquiry and complies with the terms and conditions of this Section 4.2.3. With respect to each Antigen for which Kirin exercises its rights under a Reservation License, Kirin shall (a) add such Antigen to the Kirin Non-Exclusive Antigen List pursuant to Section 2.3.2(b)(ii) hereof (except that if the Antigen is a ROFR Target, Medarex shall add such Antigen to the Shared Exclusive Antigen List), and (b) pay to Medarex a Reservation License Fee, if any, pursuant to Section 10.2 hereof. 4.2.4 Renewal of Reservation License. In the event that a Party has exercised a Reservation License with respect to an Antigen pursuant to Section 4.2.2 or 4.2.3 hereof, as applicable, such Party shall be permitted to renew such License for [*] Reservation License Periods. In the event that a Party desires to renew a Reservation License, it shall provide notice to the other Party [*] days prior to the expiration of the then-applicable Reservation License Period, in which event the notifying Party shall be deemed to have renewed the Reservation License as of the date the prior Reservation License period expires. The Party renewing a Reservation License pursuant to this Section 4.2.4 shall be required to pay to the other Party, with respect to each such renewal the additional Reservation License Fee, if any, for each renewal period pursuant to Section 10.2 hereof. 4.2.5 Covenant of Reservation License Holder. Each Party covenants to the other Party that with respect to any Antigen that is the subject of a Reservation License under which such Party has exercised rights pursuant to Section 4.2.2 or Section 4.2.3 hereof, as applicable, such Party shall not file an IND in relation to an Antibody raised against and with affinity for the Reservation Target (or in relation to any Antibody Product containing such Antibody or Antibody Material related thereto) without first exercising its rights under a Commercial License for such Reservation Target pursuant to Section 4.3 hereof and paying the Commercial License Fee, if any, pursuant to Section 10.3 hereof. Each Party further covenants to the other Party with respect to any such Antigen that, if after the Effective Date it enters into a Project Agreement in connection with a Partner Project and/or In-House Project, as the case [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -49-


 may be, with a Partner and/or an In-House Collaborator, as the case may be, in which Project Agreement it grants to such Partner and/or In-House Collaborator a sublicense under a License granted to it in this Agreement, such Project Agreement, shall provide that the Partner and/or In-House Collaborator, as the case may be, may not in the exercise of its rights under such sublicense file an IND in relation to any Antibody raised against and with affinity for such Antigen (or any Antibody Product containing such Antibody or Antibody Material related thereto) without first obtaining from such Party a sublicense under a Commercial License with respect to such Antibody. 4.3 Commercial Licenses. 4.3.1 Exercise In General. Subject to the availability of Antibodies and Antigens as determined in accordance with Article III hereof, each Party may exercise its rights under a Commercial License with respect to an Antigen pursuant to this Section 4.3 on behalf of itself, or with the intent of granting a sublicense under the Commercial License (subject to Section 8.5.1(d) hereof) as follows. 4.3.2 Commercial License Rights of Reservation License Holders. The holder of a Reservation License with respect to a Reservation Target shall, by virtue of holding such Reservation License and subject to the terms and conditions of this Agreement, including this Section 4.3.2, have a right to exercise its rights under an Antigen Non-Exclusive Commercial License with respect to such Reservation Target, and if such Reservation Target is available on an exclusive or semi-exclusive basis as determined in accordance with Section 3.2.2 or 3.3.2 hereof, as applicable, it shall have a right to exercise an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License with respect to such Antigen. The exercise requirements of this Section 4.3.2, in lieu of the exercise requirements of Sections 4.3.3 and 4.3.4 hereof, shall apply in the case of a Reservation Target. The Party holding a Reservation License with respect to a Reservation Target may exercise its rights under a Commercial License by delivering to the other Party, at any time during the Reservation License Period, a written notice indicating its desire to exercise a Commercial License, which notice shall specify the type of License under which it desires to exercise such rights (i.e., Antigen Exclusive Commercial License, an Antigen Semi-Exclusive Commercial License or Antigen Non-Exclusive Commercial License) and indicate whether such License relates to an In-House Project or Partner Project. If the Party holding a Reservation License with respect to a Target indicates that it desires to exercise an Antigen Exclusive Commercial License, an Antigen Semi-Exclusive Commercial License and/or an Antigen Non-Exclusive Commercial License with respect to such Target, and such Target is available for the exercise of such license (as determined in accordance with Article III hereof), such Party shall be deemed to have exercised such Commercial License, as of the date the Target is determined by Medarex to be so available, in the case of any exercise by Medarex, and as of the date that Medarex notifies Kirin in writing that such Target is so available, in the case of any exercise by Kirin. If the Party holding a Reservation License indicates that it desires to exercise its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive License with respect to the Reservation Target, and such Target is not available for exercise of the requested license, the requesting Party will be deemed not to have exercised any Commercial License with respect to such Target unless such Party expressly indicates in the notice provided pursuant to this Section 4.3.2 that it desires to exercise its rights under another type of Commercial License in the event that the first requested Commercial License is unavailable (and such other Commercial License is available), in which case such Party shall be deemed to have exercised its rights under such other Commercial License with respect to such Target. In the event that a Party exercises its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, such Target shall be removed from the Medarex Non-Exclusive Antigen List or the Kirin Non-Exclusive Antigen List, as applicable, and Medarex shall add such Target to the Shared Exclusive Antigen List or the Medarex Restricted Antigen List pursuant to Section 2.3.2(b)(i) or 2.3.2(b)(ii) hereof, as applicable. The Party exercising its rights under the Commercial License shall pay [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -50-


 to the other Party a Commercial License Fee, if any, pursuant to Section 10.3 hereof, and, if the License exercised is an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, an Antigen Exclusivity Fee, if any, pursuant to Section 10.4 hereof. 4.3.3 Exercise By Medarex of a Commercial License. (a) Available Antigens. In the event that Medarex desires to exercise its rights under either an Antigen Non-Exclusive Commercial License, Antigen Exclusive Commercial License, or Antigen Semi-Exclusive Commercial License with respect to an Antigen (other than a Medarex Reservation Target with respect to which Medarex has the right to exercise a Commercial License pursuant to Section 4.3.2 hereof) and determines that such Antigen is available to Medarex for the exercise of rights under such License pursuant to the terms and conditions of Section 3.2.2(a) or 3.2.2(b) hereof, Medarex shall provide notice to Kirin pursuant to this Section 4.3.3(a) and indicate that Medarex is exercising its rights under an Antigen Exclusive Commercial License, an Antigen Non-Exclusive Commercial License, or an Antigen Semi-Exclusive Commercial License, as the case may be, and whether such License is exercised in connection with an In-House Project or a Partner Project. With respect to each Antigen for which Medarex exercises a Commercial License, Medarex shall (a) add, pursuant to Section 2.3.2(b)(i) hereof, such Antigen to the Medarex Non-Exclusive Antigen List, if Medarex has exercised its rights under an Antigen Non-Exclusive Commercial License, or the Shared Exclusive Antigen List or the Medarex Restricted Antigen List, as applicable, if Medarex has exercised its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, and (b) pay to Kirin a Commercial License Fee, if any, pursuant to Section 10.3 hereof, and if such License exercised is an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, an Antigen Exclusivity Fee, if any, pursuant to Section 10.4 hereof. (b) Unavailable Antigen. In the event that Medarex desires to exercise its rights under an Antigen Exclusive Commercial License, Antigen Semi-Exclusive Commercial License, or Antigen Non-Exclusive Commercial License with respect to an Antigen (other than a Medarex Reservation Target) and determines that such Antigen is not available to Medarex for the exercise of rights under such License pursuant to the terms and conditions of Section 3.2.3 hereof, Medarex may not exercise its rights under a Commercial License with respect to such Antigen, unless and until it subsequently determines such Antigen is available pursuant to a subsequent inquiry pursuant to Section 3.2.1 hereof. (c) ROFR Targets Granted by Medarex. In the event that Medarex desires to exercise or grant rights with respect to an Antigen pursuant to Section 4.1 hereof on behalf of Medarex, a Medarex Affiliate or a Third Party, or to exercise its rights under a Commercial License on behalf of Medarex, a Medarex Partner or a Medarex In-House Collaborator with respect to an Antigen and, pursuant to Section 3.2 hereof, has knowledge that such Antigen is a ROFR Target that is the subject of Refusal Rights granted by Medarex to a Third Party, Medarex shall notify the ROFR Party that a Person has requested rights with respect to the Antigen. (i) In the event that the ROFR Party exercises its Refusal Rights with respect to such Antigen by providing written notice thereof to Medarex in a timely manner, as provided under the agreement that provides for Refusal Rights with respect to such Antigen, Medarex shall not exercise or grant any rights with respect to the Antigen (other than on behalf of the ROFR Party) unless and until the Antigen is subsequently determined to be available as part of a subsequent availability inquiry by Medarex pursuant to the terms and conditions of Section 3.2 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -51- 


 (ii) In the event that the ROFR Party, within the permitted time period for exercising Refusal Rights, declines to exercise such Refusal Rights, but elects pursuant to the agreement that provides for such Refusal Rights and/or with Medarex's consent to exercise or retain certain Antigen non-exclusive rights (including an option) with respect to such Antigen, Medarex may grant or exercise rights pursuant to Section 4.1 hereof or exercise rights under a Medarex Antigen Semi-Exclusive Commercial License or a Medarex Antigen Non-Exclusive Commercial License, as the case may be, with respect to such Antigen. In the event that Medarex elects to grant or exercise any such rights with respect to such Antigen, and to the extent consistent with the rights retained or exercised by the ROFR Party with respect to such Antigen, Medarex shall provide to Kirin notice of Medarex's exercise or grant of rights with respect to the Antigen, as the case may be, which notice shall specify the rights being granted or exercised by Medarex, and Medarex shall be deemed to have granted or exercised such rights pursuant to Section 4.3.3(f) hereof. (iii) In the event that the ROFR Party fails or declines to exercise its Refusal Rights in a timely manner under the agreement that provides for Refusal Rights with respect to such Antigen (and does not otherwise elect to retain or exercise rights with respect to such Antigen in accordance with the preceding paragraph), then pursuant to Section 4.3.3(f) hereof Medarex shall be deemed to have exercised or granted rights with respect to such Antigen. In the event that the ROFR Party, in response to the notice from Medarex pursuant to the first sentence of this Section 4.3.3(c), provides written notice to Medarex that it is exercising its Refusal Rights with respect to an Antigen, or the ROFR Party elects to obtain a license to one or more Antibody(ies) raised against such Antigen, as the case may be, and such exercise by the ROFR Party will result in the ROFR Party obtaining from Medarex a sublicense under the license granted by Kirin to Medarex in Section 8.3.6 hereof, or under a License, Medarex shall be deemed to have exercised such license on behalf of the ROFR Party as of the date on which Medarex provides notice to Kirin of the ROFR Party's exercise of its Refusal Rights or other election, and all of the terms, conditions and obligations that apply to such License under this Agreement shall apply, including, without limitation, listing obligations under Article II hereof and payment obligations under Article X hereof. (d) ROFR Targets Granted by Kirin. In the event that Medarex desires to exercise or grant rights with respect to an Antigen pursuant to Section 4.1 hereof on behalf of a Third Party, or to exercise its rights under a Commercial License on behalf of a Medarex Partner or a Medarex In-House Collaborator with respect to an Antigen and, pursuant to Section 3.2 hereof, has knowledge that such Antigen is a ROFR Target that is the subject of Refusal Rights granted by Kirin to a Third Party, Medarex shall provide a written notice thereof to Kirin. Such notice shall specify that Medarex desires to either grant rights to such Third Party with respect to the Antigen on an Antigen-exclusive basis pursuant to Section 4.1 hereof or to exercise rights under a Medarex Antigen Exclusive Commercial License with respect to the Antigen. Additionally, Medarex shall provide to Kirin a redacted copy of such Third Party's written request for a license with respect to the Antigen. Upon receipt of such notice from Medarex, Kirin shall promptly, but in any event within [*] days (x) notify the ROFR Party that a Third Party has requested exclusive rights with respect to the Antigen, and (y) provide a copy of such notice to Medarex. (i) In the event that the ROFR Party exercises its Refusal Rights with respect to such Antigen by providing written notice thereof to Kirin within [*] days after the date on which such ROFR Party receives from Kirin the notice required pursuant to clause (x) of the previous paragraph (in which case Kirin shall promptly, but in any event within [*] days after the receipt of such ROFR Party's notice, provide a copy thereof to Medarex), then (A) Kirin shall be deemed to have exercised a Kirin Antigen Exclusive Commercial License with respect to such Antigen on behalf of the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -52-


 ROFR Party as of the date on which Kirin provides notice to Medarex of the ROFR Party's exercise of its Refusal Rights, and all of the terms, conditions and obligations that apply to such Commercial License under this Agreement shall apply, including, without limitation, listing obligations under Article II hereof and payment obligations under Article X hereof, and (B) Medarex shall not exercise or grant any rights with respect to the Antigen unless and until the Antigen is subsequently determined to be available as part of a subsequent availability inquiry by Medarex pursuant to the terms and conditions of Section 3.2 hereof. (ii) In the event that the ROFR Party, within [*] days from the date on which the ROFR Party receives notice from Kirin that a Third Party has requested exclusive rights with respect to the Antigen, declines to exercise such Refusal Rights, but elects pursuant to the agreement that provides for such Refusal Rights and/or with Kirin's consent to exercise or retain certain Antigen non-exclusive rights (including an option) with respect to such Antigen, Kirin shall promptly, but in any event within [*] days after such ROFR Party's election to exercise or retain such rights, notify Medarex thereof in writing and specify the extent to which such Antigen is available for Medarex's exercise or grant of rights. In such event, (A) if the ROFR Party elected to obtain a sublicense under a Kirin Antigen Non-Exclusive License, Kirin shall be deemed to have exercised such license on behalf of the ROFR Party as of the date on which Kirin provides notice to Medarex of the ROFR Party's election to exercise such sublicense, and (B) to the extent consistent with the rights retained or exercised by the ROFR Party, Medarex may grant or exercise such rights pursuant to Section 4.1 hereof or under a Medarex Antigen Semi-Exclusive Commercial License or a Medarex Antigen Non-Exclusive Commercial License, as the case may be, with respect to such Antigen. In the event that Medarex elects to grant or exercise any such rights with respect to such Antigen, Medarex shall provide to Kirin promptly, but in any event within [*] days after the receipt by Medarex of the notice from Kirin regarding the ROFR Party's election pursuant to this Section 4.3.3(d)(ii), notice of Medarex's election (specifying the rights being granted or exercised by Medarex), in which case, Medarex shall be deemed to have granted or exercised such rights pursuant to Section 4.3.3(f) hereof. (iii) In the event that the ROFR Party fails or declines to exercise its Refusal Rights with respect to such Antigen within [*] days after receiving notice from Kirin that a Third Party has requested exclusive rights with respect to the Antigen (and does not otherwise elect to retain or exercise rights with respect to such Antigen in accordance with the preceding paragraph), then Kirin promptly, but in any event within [*] days after receipt by Kirin of a notice from such ROFR Party declining to exercise its ROFR rights, or the expiration of such [*] day period, whichever is sooner, shall notify Medarex in writing that such Antigen is available for Medarex's exercise or grant of rights. In such event, (A) Kirin's Reservation License on behalf of the ROFR Party with respect to such Antigen shall terminate and Kirin shall have no further license or other rights with respect to the Antigen unless and until it is later determined to be available pursuant to a subsequent Antigen Availability Inquiry, and (B) pursuant to Section 4.3.3(f) hereof Medarex shall be deemed to have exercised or granted rights with respect to such Antigen. (e) ROFR Targets Held by Kirin. In the event that Medarex desires to exercise or grant rights with respect to an Antigen pursuant to Section 4.1 hereof on behalf of a Third Party, or to exercise its rights under a Commercial License on behalf of a Medarex Partner or Medarex In-House Collaborator with respect to an Antigen and, pursuant to Section 3.2 hereof, has knowledge that such Antigen is a ROFR Target for which Kirin holds Refusal Rights, Medarex shall provide a written notice thereof to Kirin. Such notice shall specify that Medarex desires to either grant rights to such Third Party with respect to the Antigen on an Antigen non-exclusive or Antigen-exclusive basis pursuant to Section 4.1 hereof or to exercise rights under a Medarex Antigen Exclusive Commercial License, a Medarex Antigen Semi-Exclusive Commercial License or a Medarex Antigen Non-Exclusive [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -53-


 Commercial License with respect to the Antigen. Additionally, Medarex shall provide to Kirin a redacted copy of such Third Party's written request for a license with respect to the Antigen. (i) In the event that Kirin exercises its Refusal Rights with respect to such Antigen by providing written notice of such exercise to Medarex within [*] days after receiving Medarex's notice under this Section 4.3.3(e), Kirin shall be deemed to have exercised a Kirin Antigen Exclusive Commercial License with respect to such Antigen as of the date of such notice and Medarex shall not exercise or grant any rights with respect to the Antigen unless and until the Antigen is subsequently determined to be available as part of a subsequent availability inquiry by Medarex pursuant to the terms and conditions of Section 3.2 hereof. (ii) In the event that Kirin declines to exercise such Refusal Rights, but elects to retain a Reservation License with respect to such Antigen, Kirin shall provide written notice thereof to Medarex within [*] days after receiving Medarex's notice under this Section 4.3.3(e). In the event that Kirin timely provides such notice to Medarex, then (A) Kirin shall retain such Reservation License, but as of the date of such notice shall no longer have Refusal Rights with respect to such Antigen, and (B) Medarex may exercise or grant rights consistent with the rights exercised by Kirin with respect to such Antigen pursuant to Section 4.1 hereof, or under a Medarex Antigen Semi-Exclusive Commercial License or a Medarex Antigen Non-Exclusive Commercial License. In the event that Medarex elects to grant or exercise any such rights with respect to such Antigen, Medarex shall provide to Kirin promptly, but in any event within [*] days after the receipt by Medarex of the notice from Kirin regarding its exercise of a Kirin Antigen Non-Exclusive Commercial License pursuant to this Section 4.3.3(e)(ii), notice of Medarex's election (specifying the rights being granted or exercised by Medarex), in which case, Medarex shall be deemed to have granted or exercised such rights pursuant to Section 4.3.3(f) hereof. (iii) In the event that Kirin fails or declines to exercise its Refusal Rights with respect to such Antigen within [*] days after receiving Medarex's notice under this Section 4.3.3(e) (and does not elect to retain or exercise rights with respect to such Antigen in accordance with the preceding paragraph), then (A) pursuant to Section 4.3.3(f) hereof Medarex shall be deemed to have exercised or granted exclusive rights with respect to such Antigen pursuant to Section 4.1 hereof, or to exercise exclusive rights under a Commercial License with respect to such Antigen, and (B) Kirin's Reservation License and its Refusal Rights with respect to such Antigen shall terminate and Kirin shall have no further license or other rights with respect to the Antigen unless and until it is later determined to be available pursuant to a subsequent Antigen Availability Inquiry. (f) Medarex's Exercise of Rights to the Antigen That Was Subject to Refusal Rights. In the event that Medarex has provided notice to Kirin pursuant to Section 4.3.3(c), (d), or (e) hereof that Medarex, any of its Affiliates, or any Third Party desires to obtain or exercise a license with respect to a particular Antigen, then as of the date on which Medarex has knowledge, pursuant to Section 4.3.3(c), (d) or (e) above, that the ROFR Party failed or declined to exercise timely its Refusal Rights with respect to such Antigen, or that the ROFR Party has declined to exercise Refusal Rights with respect to an Antigen but has timely elected to exercise or retain certain Antigen non-exclusive rights with respect to an Antibody(ies) against such Antigen, (and to the extent consistent with the ROFR Party's rights with respect to such Antigen, if any), Medarex shall be automatically deemed to have exercised or granted rights with respect to such Antigen pursuant to Section 4.1 hereof, or to have exercised its rights under a Medarex Antigen Exclusive Commercial License, Medarex Antigen Non-Exclusive Commercial License, or Medarex Antigen Semi-Exclusive Commercial License, as the case may be, with respect to a particular Antigen, as specified in the notices required under Sections 4.3.3(c), (d) or (e) above, and all of the terms, conditions and obligations that apply to such specified rights under this Agreement shall apply, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchan ge Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -54- 


 including, without limitation, listing obligations under Article II hereof and payment obligations, if any, under Article X hereof. 4.3.4 Exercise by Kirin of a Commercial License. (a) Notice. In the event that Kirin desires to exercise its rights under a Commercial License with respect to an Antigen (other than a Kirin Reservation Target with respect to which Kirin has the right to exercise a Commercial License pursuant to Section 4.3.2 hereof), it shall make an Antigen Availability Inquiry to Medarex in accordance with the terms of Section 3.3.1(a) hereof, and as part of such inquiry shall notify Medarex (i) that Kirin desires to exercise its rights under an Antigen Exclusive Commercial License, Antigen Non-Exclusive Commercial License, or Antigen Semi-Exclusive Commercial License, as the case may be, with respect to the Antigen that is the subject of the inquiry, and (ii) whether the License with respect to which Kirin desires to exercise rights relates to an In-House Project or a Partner Project. Within the time in which Medarex is required to respond to such Antigen Availability Inquiry pursuant to Section 3.3.1(c) hereof, Medarex shall inform Kirin whether such Antigen is available to Kirin for Kirin's exercise of its rights under the applicable License, as determined in accordance with Sections 3.3.2, 3.3.3 and 3.3.4 hereof. (b) Available Antigen. In the event that Medarex notifies Kirin pursuant to Section 4.3.4(a) hereof that the Antigen that is the subject of an Antigen Availability Inquiry is available to Kirin for the exercise of the License designated in the notice provided by Kirin to Medarex pursuant to Section 4.3.4(a) hereof, Kirin shall be deemed to have exercised a Commercial License for such Antigen as of the date Medarex provides such notice to Kirin. With respect to each Antigen for which Kirin has exercised its rights under an Antigen Non-Exclusive Commercial License, Kirin shall add such Antigen to the Kirin Non-Exclusive Antigen List pursuant to Section 2.3.2(b)(ii) hereof. With respect to each Antigen for which Kirin has exercised its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License, Medarex shall add such Antigen to the Shared Exclusive Antigen List pursuant to Section 2.3.2(b)(ii) hereof. Kirin shall pay to Medarex a Commercial License Fee, if any, for each Antigen with respect to which Kirin has exercised its rights under a Commercial License pursuant to Section 10.3 hereof, and if the License is an Antigen Exclusive Commercial License or Antigen Semi-Exclusive Commercial License, an Antigen Exclusivity Fee, if any, pursuant to Section 10.4 hereof. (c) Unavailable Antigen. In the event that Medarex notifies Kirin pursuant to Section 4.3.4(a) hereof that the Antigen that is the subject of an Antigen Availability Inquiry is not available to Kirin for the exercise of a Commercial License designated in the notice provided by Kirin pursuant to Section 4.3.4(a) hereof, Kirin may not exercise its rights under a Commercial License with respect to such Antigen, unless and until it subsequently determines such Antigen is available pursuant to a subsequent Antigen Availability Inquiry and complies with the terms and conditions of this Section 4.3.4. If Kirin has given notice to Medarex of Kirin's desire to exercise its rights under an Antigen Exclusive Commercial License and such Antigen is not available for use on an exclusive basis, Kirin may exercise its rights under an Antigen Semi-Exclusive Commercial License or Antigen Non-Exclusive Commercial License with respect to such Antigen upon submitting to Medarex a subsequent Antigen Availability Inquiry and a revised notice indicating that Kirin desires to exercise its rights under such a License with respect to such Antigen, provided that Medarex confirms its availability for such exercise upon receipt of such subsequent inquiry and revised notice pursuant to the terms of Article III hereof. (d) ROFR Targets Granted By Medarex. In the event that Medarex notifies Kirin pursuant to Section 4.3.4(a) hereof that the Antigen that is the subject of an Antigen Availability [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -55-


 Inquiry and a request by Kirin to exercise rights under a Commercial License is a ROFR Target with respect to which Medarex has granted Refusal Rights to a Third Party, Medarex shall promptly, but in any event within [*] days, (x) notify the ROFR Party that a Person has requested rights with respect to the Antigen, (y) provide a redacted copy of the notice to Kirin, and (z) to the extent that Medarex is permitted to do so consistent with its confidentiality obligations to the ROFR Party, as determined by Medarex in Medarex's reasonable discretion, disclose to Kirin the ROFR Party's deadline for exercising its Refusal Rights for the Antigen if such deadline is greater than [*] days from notice provided by Medarex that a Person desires rights to such Antigen; provided, however, that in the event that the agreement that provides Refusal Rights with respect to such Antigen provides that such rights are triggered by a Third Party's request for exclusive commercial rights with respect to such Antigen and/or Antibodies against such Antigen, Medarex shall have no obligation to provide the ROFR Party notice in accordance with clause (x) of this Section (or to provide a copy of such notice to Kirin) unless Kirin has requested a Kirin Antigen Exclusive Commercial License with respect to such Antigen. In any instance where Kirin has requested a Commercial License with respect to a ROFR Target that is subject to this Section 4.3.4(d) and Medarex determines due to the nature of the rights requested by Kirin that Medarex does not have an obligation to notify the ROFR Party of such request consistent with the foregoing sentence, Medarex shall notify Kirin in writing within [*] days after the receipt by Medarex of Kirin's request for a Commercial License that Medarex has received its request for a Commercial License with respect to the Antigen, the Antigen is a ROFR Target, and Medarex has no obligation to notify the ROFR Party of such request. (i) In the event that Medarex provides notice to the ROFR Party in accordance with the first paragraph of this Section 4.3.4(d) and the ROFR Party exercises its Refusal Rights with respect to the Antigen by providing timely written notice thereof to Medarex, Medarex shall promptly, but in any event within [*] days after such ROFR Party's notice, provide written notice thereof to Kirin, and Kirin shall not exercise or grant rights under any Commercial License with respect to such Antigen unless and until the Antigen is determined to be available in response to a subsequent Antigen Availability Inquiry. (ii) In the event that Medarex provides notice to the ROFR Party in accordance with the first paragraph of this Section 4.3.4(d) and the ROFR Party, within the time period for exercising Refusal Rights declines to exercise such Refusal Rights, but elects pursuant to the agreement that provides for such Refusal Rights and/or with Medarex's consent to exercise or retain certain Antigen non-exclusive rights (including an option) with respect to such Antigen, Medarex shall promptly, but in any event within [*] days after the ROFR Party's election to exercise or retain such rights, notify Kirin thereof, and to the extent consistent with the rights retained or exercised by the ROFR Party, Kirin may exercise a Kirin Antigen Semi-Exclusive Commercial License or a Kirin Antigen Non-Exclusive Commercial License with respect to such Antigen. In the event that Kirin elects to grant or exercise any such rights with respect to such Antigen, Kirin shall provide to Medarex promptly, but in any event within [*] days after the receipt by Kirin of the notice from Medarex regarding the ROFR Party's election pursuant to this Section 4.3.4(d)(ii), notice of Kirin's election (specifying the license under which rights are being exercised by Kirin), in which case, Kirin shall be deemed to have granted or exercised such rights pursuant to Section 4.3.3(f) hereof. (iii) In the event that Medarex provides notice to the ROFR Party in accordance with the first paragraph of this Section 4.3.4(d), and the ROFR Party fails or declines to exercise its Refusal Rights for the Antigen within a timely manner as provided under the agreement that provides for Refusal Rights with respect to such Antigen (and does not otherwise elect to retain or exercise rights with respect to such Antigen in accordance with the preceding paragraph), then Medarex shall promptly, but in any event within [*] days after the expiration of the period in which such ROFR Party has a right to exercise Refusal Rights, notify Kirin in writing that the Antigen is available for [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -56-


 Kirin's exercise of a Commercial License, and pursuant to Section 4.3.4(f) Kirin shall be deemed to have exercised a Kirin Antigen Exclusive Commercial License or a Kirin Antigen Non-Exclusive Commercial License, as specified in the notice provided by Kirin to Medarex in connection with the Antigen Availability Inquiry. In the event that the ROFR Party, in response to the notice from Medarex pursuant to the first sentence of this Section 4.3.4(d), provides written notice to Medarex that it is exercising its Refusal Rights with respect to an Antigen, or the ROFR Party elects to obtain a license to one or more Antibody(ies) raised against and with affinity for such Antigen, as the case may be, and such exercise by the ROFR Party will result in such ROFR Party obtaining from Medarex a sublicense under the license granted by Kirin to Medarex in Section 8.3.6 or under a Medarex Antigen Exclusive Commercial License or a Medarex Antigen Non-Exclusive Commercial License, Medarex shall be deemed to have exercised such license on behalf of the ROFR Party as of the date on which Medarex provides notice to Kirin of the ROFR Party's exercise of its Refusal Rights or other election, and all of the terms, conditions and obligations that apply to such Commercial License under this Agreement shall apply, including, without limitation, listing obligations under Article II hereof and payment obligations under Article X hereof. (e) ROFR Targets Granted by Kirin. In the event that Kirin desires to exercise rights under a Commercial License with respect to an Antigen that is a ROFR Target with respect to which Kirin has granted Refusal Rights to a Third Party, Kirin shall notify the ROFR Party that a Person has requested rights with respect to the Antigen, and Kirin shall also promptly provide a copy of such notice to Medarex and indicate the type of Commercial License under which Kirin desires to exercise rights with respect to such Antigen. (i) In the event that within [*] days after the date on which such ROFR Party receives from Kirin written notice that a Person desires rights with respect to the Antigen the ROFR Party exercises its Refusal Rights with respect to such Antigen by providing written notice thereof to Kirin, Kirin shall within [*] days after the receipt of such notice provide written notice thereof to Medarex, together with a copy of the ROFR Party's notice, and Kirin shall not exercise or grant its rights under any Commercial License (other than on behalf of the ROFR Party) with respect to such Antigen unless and until the Antigen is determined to be available in response to a subsequent Antigen Availability Inquiry. (ii) In the event that the ROFR Party, within [*] days after the date on which such ROFR Party receives from Kirin written notice that a Person desires rights with respect to the Antigen, declines to exercise such Refusal Rights, but elects pursuant to the agreement that provides for such Refusal Rights and/or with Kirin's consent to exercise or retain certain Antigen non-exclusive rights (including an option) with respect to such Antigen, Kirin shall promptly, but in any event within [*] days after the ROFR Party's election to exercise or retain such rights, notify Medarex thereof. To the extent consistent with the rights retained or exercised by the ROFR Party, Kirin may exercise such Kirin Antigen Semi-Exclusive Commercial License or Kirin Antigen Non-Exclusive Commercial License, as the case may be, with respect to such Antigen. In the event that Kirin elects to grant or exercise any such rights with respect to such Antigen, Kirin shall notify Medarex, as part of the notice provided by Kirin to Medarex with regard to such ROFR Party's election pursuant to this Section 4.3.4(e)(ii), of Kirin's election to exercise or grant of rights with respect to the Antigen, as the case may be, which notice shall specify the rights being exercised by Kirin, in which case Kirin shall be deemed to have granted or exercised such rights pursuant to Section 4.3.3(f) hereof. (iii) In the event that the ROFR Party fails or declines to exercise its Refusal Rights for the Antigen within [*] days after receipt thereof (and does not otherwise elect to retain [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -57-


 or exercise rights with respect to such Antigen in accordance with the preceding paragraph), then Kirin shall promptly, but in any event within [*] days after the expiration of such [*] day period, notify Medarex thereof in writing that such Antigen is available for Kirin's exercise or grant of a Commercial License and Kirin shall be deemed to have exercised a Kirin Antigen Exclusive Commercial License with respect to the Antigen pursuant to Section 4.3.4(f) hereof. In the event that the ROFR Party, in response to the notice from Kirin pursuant to the first sentence of this Section 4.3.4(e), provides written notice to Kirin that it is exercising its Refusal Rights with respect to an Antigen, or elects in accordance with this Section 4.3.4(e) to obtain a sublicense under a Kirin Antigen Non-Exclusive Commercial License, as the case may be, Kirin shall be deemed to have exercised a Kirin Antigen Exclusive Commercial License or a Kirin Antigen Non-Exclusive Commercial License, as the case may be, on behalf of the ROFR Party as of the date on which Kirin provides notice to Medarex of the ROFR Party's exercise of its Refusal Rights or other election, and all of the terms, conditions and obligations that apply to such Commercial License under this Agreement shall apply, including, without limitation, listing obligations under Article II hereof and payment obligations under Article X hereof. (f) Kirin's Exercise of Rights to the Antigen That Was Subject to Refusal Rights. In the event that Kirin has provided notice to Medarex pursuant to Section 4.3.4(d) or (e) hereof that Kirin desires to exercise its rights under a Commercial License with respect to a particular Antigen, then as of the date on which Medarex provides notice to Kirin pursuant to Section 4.3.4(d) hereof that the ROFR Party has declined to exercise Refusal Rights and/or has exercised less than all of the available rights with respect to such Antigen, in the case of a ROFR Party to which Medarex has granted Refusal Rights, or the date on which Medarex has received notice from Kirin pursuant to Section 4.3.4(e) hereof that the ROFR Party has declined to exercise Refusal Rights and/or has exercised less than all of the available rights with respect to such Antigen, in the case of a ROFR Party to which Kirin has granted Refusal Rights, and to the extent consistent with the ROFR Party's rights with respect to such Antigen, if any, Kirin shall be automatically deemed to have exercised rights under a Kirin Antigen Exclusive Commercial License, Kirin Antigen Non-Exclusive Commercial License, or Kirin Antigen Semi-Exclusive Commercial License with respect to such Antigen, as specified in the Antigen Availability Inquiry provided by Kirin to Medarex with respect to such Antigen, and all of the terms, conditions and obligations that apply to such Commercial License under this Agreement shall apply, including, without limitation, listing obligations under Article II hereof and payment obligations under Article X hereof. 4.4 [*]. 4.4.1 In General. Each Party (and its Affiliates, Partners and In-House Collaborators) shall have the right to exercise the licenses and other rights granted to it under a Commercial License pursuant to Article VIII hereof only with respect to [*]; provided, however, that in the case of a Special Licensee, the Special Licensee shall be permitted to exercise a sublicense under the rights granted to Medarex in Section 8.3.6 hereof with respect to [*] Antibodies selected by such Special Licensee pursuant to the terms and conditions of the Special License. (a) [*]. Within the scope of a Party's Antigen Non-Exclusive Commercial License with respect to a particular Antigen, a Party shall have the right to [*], subject to the availability of such [*] as determined in accordance with Article III hereof, and the terms and conditions of Section 4.4.2 hereof; provided, however, that a Party shall have the right to [*], with the prior written consent of the other Party, [*]. (b) [*]. A Party that has exercised its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License with respect to a particular [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -58- 


 Antigen pursuant to Section 8.2.4(a), 8.2.4(c), 8.3.4(a), or 8.3.4(c) hereof, as applicable, shall have the right to [*] for such License [*], subject to the availability of such [*] as determined in accordance with Article III hereof and the terms and conditions of Section 4.4.2 hereof. 4.4.2 [*]. A Party that has exercised its rights under a Commercial License granted by the other Party herein with respect to a particular Antigen shall, subject to Section 4.4.1, 4.4.2(a), 4.4.2(b) or 4.4.2(c) hereof, as applicable, be permitted to [*] for such License, as follows: (a) By Medarex. (i) Antibody Identification Notice. If at any time during the term of a Commercial License granted by Kirin to Medarex, Medarex desires to [*] for such Commercial License and determines that such Collaboration Antibody is available to Medarex pursuant to the terms and conditions of Section 3.4 hereof, Medarex shall provide written notice to Kirin and indicate that it is [*] (which notice need not identify the Collaboration Antibody). In the written notice provided by Medarex to Kirin pursuant to this Section 4.4.2(a)(i), Medarex shall identify the Collaboration Antibody and the Medarex Commercial Target against which such Collaboration Antibody was raised by the code assigned by Medarex pursuant to the Coding System and shall not be required in such notice to identify the Collaboration Antibody by its Antibody Amino Acid Sequence or the Medarex Commercial Target by a sequence or other identifying information. (ii) Antibody Available. Upon the giving of notice to Kirin pursuant to this Section 4.4.2(a) hereof, such Collaboration Antibody shall be deemed to be [*]. Medarex shall add each Collaboration Antibody [*] to the Antibody Sequence List pursuant to Section 2.3.2(b)(iii) hereof. (iii) Antibody Unavailable. In the event that such Collaboration Antibody is not available [*], as determined in accordance with Article III hereof, Medarex may not [*] such Collaboration Antibody [*], unless and until it subsequently determines such Collaboration Antibody is available, as determined in accordance with Article III hereof. (b) By Kirin. (i) Antibody Identification Notice. If at any time during the term of a Commercial License granted by Medarex to Kirin, Kirin desires to [*] for such Commercial License, Kirin shall make an Antibody Availability Inquiry to Medarex in accordance with the terms of Section 3.5.1 hereof, and as part of such inquiry shall (a) notify Medarex that Kirin desires to [*], and (b) identify the Kirin Commercial Target against which such Antibody was raised. Within [*] business days Medarex shall notify Kirin in writing whether such Collaboration Antibody is available to Kirin, as determined in accordance with Section 3.5.1 hereof. (ii) Antibody Available. In the event that Medarex notifies Kirin that such Collaboration Antibody is available to Kirin [*], such Collaboration Antibody shall be deemed to be [*] as of the date that Medarex notifies Kirin of such availability. Medarex shall add each Collaboration Antibody [*] to the Antibody Sequence List pursuant to Section 2.3.2(b)(iii) hereof. (iii) Antibody Unavailable. In the event that Medarex notifies Kirin that such Collaboration Antibody is not available to Kirin [*], Kirin may not [*] such Collaboration Antibody [*], unless and until it subsequently determines such Collaboration Antibody is available in response to a subsequent Antibody Availability Inquiry pursuant to Section 4.4.2(b). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -59-


 (c) [*] Each Party shall have the right with respect to any Commercial License granted to it by the other Party to [*] for such Commercial License with a [*], subject to the availability of the [*]. A Party that desires to [*] shall provide written notice thereof to the other Party and satisfy the terms and conditions in Section 4.4.2(a)(ii) or 4.4.2(b)(ii) hereof, as applicable, governing [*] of a Collaboration Antibody [*]. If the Collaboration Antibody that such Party seeks to [*] is determined to be available in accordance with Section 3.4 or 3.5 hereof, as applicable, then in the case of designations made by Medarex, such [*] shall be deemed to be [*] as of the date it provides such written notice to Kirin, and in the case of Kirin, such [*] shall be deemed to be [*] as of the date that Medarex notifies Kirin in writing of such Collaboration Antibody's availability. From and after the [*] Date, the [*] that was [*] shall be [*] and the holder of the Commercial License with respect to [*] shall have no further rights to Exploit or have Exploited such Collaboration Antibody or Collaboration Products containing such Collaboration Antibody. Medarex shall [*] from the Antibody Sequence List in accordance with Section 2.3.3(b) hereof and [*] to the Antibody Sequence List in accordance with Section 2.3.2(b)(iii) hereof, whereupon the [*] shall no longer constitute a [*], and such [*] shall be deemed a [*]. ARTICLE V IN-HOUSE PROJECTS 5.1 In-House Target List. 5.1.1 In-House Target Lists. Each Party shall prepare and maintain an In-House Target List in accordance with Section 2.2.1 hereof. 5.1.2 [*]. Except as set forth in Section 5.1.3(d)(i) or 5.3.2 hereof, and in accordance with Section 5.5 hereof, each Party, when including In-House Targets on its respective In-House Target List, shall not include [*]. 5.1.3 Designation of Targets on In-House Target List. (a) Designation of Targets On or After the Effective Date. If on or after the Effective Date a Party exercises its rights under a Reservation License pursuant to Section 4.2 hereof or a Commercial License pursuant to Section 4.3 hereof with respect to an Antigen in connection with an In-House Project, the Party exercising such rights shall designate such Antigen as an In-House Target and note the corresponding Designation Date on its In-House Target List within [*] business days after the exercise of such rights. Such Target shall remain on such Party's In-House Target List unless and until such Target is removed therefrom pursuant to Section 5.5 hereof. [*], a Party shall not exercise a License pursuant to Article IV hereof with respect to an Antigen in connection with an In-House Project if the exercise of such License and corresponding designation of such Antigen on such Party's In-House Target List would cause such Party to [*]. (b) Designation of Targets Before the Effective Date. If prior to the Effective Date a Party designated one or more Antigens on its In-House Target List in reliance on the Agreement on Essential Terms for Collaboration, the Designation Date for each such Target shall be the date on which the Designating Party added such Target to its In-House Target List (as noted on such list). Such Target(s) shall remain on such In-House Target List unless and until such Target is removed therefrom pursuant to Section 5.5 hereof. (c) Further Designation of Targets as [*] Targets or [*] Targets. Except in the case of an Antigen selected by a Party as a [*] Target pursuant to Section 5.3.2 hereof, which Antigen [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -60-


 shall be designated as a [*] Target at the time such Antigen is listed on the In-House Target List, each Party shall be permitted to list an Antigen on its In-House Target List pursuant to Section 5.1.3(a) or (b) hereof without further designating at the time of such listing whether the Antigen is a [*] Target or a [*] Target, provided that such Party further designates such Antigen as a [*] Target pursuant to Section 5.3 hereof or a [*] Target pursuant to Section 5.2 hereof prior to such Party exercising rights under any Commercial License with respect to one or more Antibodies raised against and with affinity for such Target. In addition, at any time after a Party adds an Antigen to its In-House Target List, such Party shall be permitted to designate such Antigen as an [*] Target pursuant to Section 5.4 hereof. (d) Opt-In Process and Effects on the [*]. At any time during the Term, a Party may in its sole discretion make an Opt-In Offer to the other Party in accordance with the terms of this Section 5.1.3(d) hereof with respect to an Antigen on or intended to be added to the offering Party's In-House Target List. (i) Opt-In Process With Respect to New Targets. In the event that the Designating Party desires to have the Non-Designating Party collaborate on an In-House Project with respect to an Antigen that has not yet been added to the Designating Party's In-House Target List, regardless of whether such designation will result in the Designating Party [*], the Designating Party shall (A) provide written notice to the other Party that it desires to exercise its rights pursuant to this Section 5.1.3(d)(i) with respect to such Antigen and simultaneously therewith make an Opt-In Offer to the other Party with respect to such Antigen, and (B) as of the date of such notice designate such Antigen as an In-House Target and note the corresponding Designation Date on its In-House Target List. Within [*] business days after the Designation Date, subject to Section 5.1.3(d)(iii) hereof, the Designating Party shall provide to the Non-Designating Party Antigen Evaluation Materials relating to such Target and thereafter [*] to the Non-Designating Party in its review and analysis of such materials. The Non-Designating Party shall have [*] days from the date on which a complete set of the Antigen Evaluation Materials is received to accept or reject the Designating Party's Opt-In Offer; provided, however, if at the time that the Designating Party makes an Opt-In Offer to the Non-Designating Party with respect to an Antigen, the Designating Party's designation of such Antigen on its In-House Target List will not cause the Designating Party to [*], the Non-Designating Party may request that the Designating Party consent to [*] days within which to accept or reject the Opt-In Offer, [*]. In the event that the Non-Designating Party timely accepts the Opt-In Offer, the Parties shall negotiate [*] the terms and conditions of a definitive agreement governing the subject matter of the Opt-In Offer and such Target shall [*] during the negotiation period. In the event that the Parties are unable [*] to reach agreement on the terms of a definitive agreement with respect to the subject matter of the Opt-In Offer within [*] days after the date on which the Antigen Evaluation Materials are received by the Non-Designating Party (or within such longer negotiation period as the Parties may agree upon in writing), if as of the date on which such period expires the Designating Party's inclusion of such Target on its In-House Target List results in such Party [*], the Designating Party shall remove such Antigen from its In-House Target List and its License with respect to such Antigen shall automatically terminate, unless as of such date such Party (y) exercises its rights under a Commercial License with respect to such Antigen pursuant to Section 4.3 hereof, and (z) selects such Target as a [*] Target pursuant to Section 5.3 hereof. In the event that the Designating Party and the Non-Designating Party enter into a definitive agreement as contemplated by this Section 5.1.3(d)(i) or if the Non-Designating Party rejects or otherwise fails to respond to the Opt-In Offer within the [*] day period (and any extensions thereof agreed to by the Parties pursuant to this Section), the Designating Party shall have the right to retain the Target on its In-House Target List and such Target shall [*], unless and until such Target is removed from such Party's In-House Target List pursuant to clause (b) of Section 5.5 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -61-


 (ii) Opt-In Process With Respect to Listed Targets. In the event that the Designating Party desires to have the Non-Designating Party collaborate on an In-House Project with respect to a Target that has already been added by the Designating Party to its In-House Target List, the Designating Party shall provide written notice to the other Party that it desires to make an Opt-In Offer to the Non-Designating Party with respect to such Target. Within [*] business days after the date of such notice, subject to Section 5.1.3(d)(iii) hereof, the Designating Party shall provide to the Non-Designating Party Antigen Evaluation Materials relating to such Target and thereafter [*] to the Non-Designating Party in its review and analysis of such materials. The Non-Designating Party shall have [*] days from the date on which a complete set of Antigen Evaluation Materials are received to accept or reject the Designating Party's Opt-In Offer; provided, however, that the Non-Designating Party may request that the Designating Party consent to [*] days within which to accept or reject the Opt-In Offer, [*]. In the event that the Non-Designating Party accepts the Opt-In Offer, the Parties shall negotiate [*] the terms and conditions of a definitive agreement; provided, however, that such Target shall continue to [*] during the negotiation period. In the event that the Non-Designating Party rejects the Opt-In Offer or that the Parties are not otherwise able to reach agreement on the terms of a definitive agreement with respect to the subject matter of the Opt-In Offer within [*] after the date on which the Antigen Evaluation Materials are received by the Non-Designating Party (or within such longer negotiation period as the Parties may agree upon in writing), the Target shall continue to [*] unless and until such Target is removed from such Party's In-House Target List pursuant to clause (b) of Section 5.5 hereof. In the event that the Designating Party and the Non-Designating Party enter into a definitive agreement governing the subject matter of the Opt-In Offer, the Target shall [*] as of the effective date of such definitive agreement. (iii) Antigen Evaluation Materials. With respect to any Antigen Evaluation Materials to be provided by the Designating Party to the Non-Designating Party pursuant to Section 5.1.3(d)(i) or 5.1.3(d)(ii) hereof, the Designating Party shall provide to the Non-Designating Party any and all Antigen Evaluation Materials that [*] select such Antigen as an In-House Target, exercise rights with respect to such Antigen and/or make an Opt-In Offer with respect to such Antigen. Subject to any applicable exclusion(s) set forth in clauses (a) through (e) of Section 1.38 (Confidential Information), any and all Antigen Evaluation Materials provided by the Designating Party to the Non-Designating Party shall be deemed the Confidential Information of the Designating Party and be subject to the terms and conditions of Article XIII hereof. In the event that any Antigen Evaluation Materials to be provided hereunder by the Designating Party include any material [*] as determined by the Designating Party, the Designating Party shall notify the Non-Designating Party and disclose to such Non-Designating Party the nature of such material and the Parties shall confer [*]. In the event the Non-Designating Party determines that the disclosure of such material is [*], the Designating Party shall have [*]. In the event the Non-Designating Party determines [*], the Designating Party shall have the right to [*] such materials to the Non-Designating Party or [*] the Opt-In Offer in the event that [*]. (iv) [*] Relating to Opt-Ins. Each Party [*] to the other Party that it shall exercise its rights under this Section 5.1.3(d) [*] and [*]. 5.2 [*] Target Selection. 5.2.1 [*] Target Rights. During the Term of the Agreement, each Party shall accumulate rights to designate Targets on its In-House Target List as [*] Targets (each a "[*] Target Right"), which rights shall accrue to each Party on a Target-by-Target basis, commencing as of January 1, 2000, at an [*] of [*] Targets in one year and [*] Targets in the next year, accruing at the beginning of each Calendar Year, until, with respect to a Party, such Party has accumulated [*] Target Rights in the aggregate (for exercise during the Term), at which point [*] Target Rights shall accrue for such Party. A [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -62-


 Party shall be permitted to select a Target on its In-House Target List as a [*] Target only after a [*] Target Right has accrued to such Party. Once a [*] Target Right is used by a Party such right shall be deemed to have expired (even in the event that such Target is later redesignated by such Party as a [*] Target or with respect to which Target such Party later implements an In-House Project Status Change pursuant to Section 7.1 hereof) and, except in accordance with the terms of Section 5.2.2 hereof, may [*]. A Target that is selected by a Party as a [*] Target in accordance with Section 5.3 hereof may be redesignated by such Party as a [*] Target, in which case the Designating Party shall be required, pursuant to [*] to the other Party with respect to such Target [*]. By way of example and without limitation, in the event that Kirin as the Designating Party achieves [*] at the time when the Target is designated as a [*] Target and [*] after the Target has been redesignated as a [*] Target, [*]. 5.2.2 Substitution of [*] Targets. (a) [*] Target Substitution. Subject to the terms of Section 5.2.2(b) hereof, in the event that the Designating Party, prior to the [*] with respect to a [*] Target, (i) abandons research, development and/or commercialization activities with respect to a [*] Target (and terminates its Reservation License or Commercial License, as the case may be, with respect to such Target), or (ii) redesignates the [*] Target as a [*] Target pursuant to Section 5.3.1 hereof, such Party shall have the right to make a [*] Target Substitution with respect to such [*] Target by providing prompt written notice thereof to the other Party; provided, however, that [*] Party shall be permitted to make [*] during the Term of this Agreement. (b) [*] Target Substitution Fee. At the time that a Party makes a [*] Target Substitution, such Party shall pay the other a [*] Target Substitution Fee. 5.3 [*] Target Selection. 5.3.1 In General. Subject to the terms of Sections 5.1 and 5.3.2 hereof, each Party shall be permitted to select [*] In-House Targets as [*] Targets during the Term of this Agreement. Upon selection by a Party of a Target on its In-House Target List as a [*] Target, such Party shall [*]. A Target that is selected by a Party as a [*] Target in accordance with Section 5.2 hereof may be redesignated by such Party as a [*] Target, in which case the Designating Party shall be required, pursuant to [*]. By way of example and without limitation, in the event that Kirin as the Designating Party achieves [*] at the time when the Target is designated as a [*] Target and [*] after the Target has been redesignated as a [*] Target, Kirin shall [*]. 5.3.2 Designation of [*] Targets in [*]. At any time on or after the Effective Date, in the event that a Party desires to select an Antigen for the exercise of rights under a License pursuant to Article IV hereof in connection with an In-House Project and the exercise of such rights and the corresponding designation of such Antigen on such Party's In-House Target List would cause such Party to [*], such Party may [*] exercise such rights and designate the Antigen as a Target on its In-House Target List, subject to the availability of such Antigen as determined in accordance with Article III hereof, by providing written notice thereof to the other Party and simultaneously therewith (a) exercising its rights under a Commercial License with respect to such Antigen pursuant to Section 4.3 hereof, (b) designating such Antigen as a Target and noting the corresponding Designation Date on its In-House Target List, and (c) selecting such Target as a [*] Target. Within [*] days after the date of such notice, the Designating Party shall [*]. Such Target shall remain on such Party's In-House Target List unless and until such Target is removed pursuant to clause (b) of Section 5.5 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -63-


 5.4 [*] Target Selection. A Party shall have the right in its sole discretion to [*] a Target [*] its In-House Target List at any time during the Term of this Agreement [*], in which event such Party shall promptly notify the other Party thereof, whereafter such Target shall [*]. Thereafter, except to the extent licensed under the Evaluation License granted to such Party in Sections 8.2.2 or 8.3.2 hereof, as the case may be, such Party shall have [*] with respect to such Antigen; provided, however, that if such Party subsequently determines that it or one of its Affiliates or In-House Collaborators desires to pursue such Antigen, then, subject to receiving confirmation of availability pursuant to Article III hereof, and the exercise of rights under a License with respect to such Antigen pursuant to Article IV hereof, then subject to Section 5.1.2 hereof, such Party may [*] designate such Antigen as a Target and [*] it to its In-House Target List. 5.5 Removing Targets from the [*] and the Target List. A Target that has been designated by a Party as an In-House Target shall (a) [*] upon (i) designation by such Party of such Target as a [*] Target, (ii) the occurrence of the [*] by such Party (or any of its Affiliates or sublicensees) of a [*] Target Product related to such Target in any Major Country, (iii) designation by such Party of such Target as an [*] Target pursuant to Section 5.4 hereof, (iv) the execution by the Parties of a separate written agreement pursuant to which the Parties collaborate with respect to the development and commercialization of a Collaboration Product against such Target, or (v) satisfaction of the applicable conditions provided in Section 5.1.3(d)(i) hereof with respect to Opt-In Offers; and (b) be removed by a Party from its In-House Target List if such Party designates such Target as an [*] Target pursuant to Section 5.4 hereof or terminates in its entirety the License to which such Target relates; provided, however, that nothing contained in this Section 5.5 shall be interpreted to alter or otherwise terminate any payment obligation, including, without limitation, any royalty obligation applicable to products directed against such Target pursuant to Section 10.6 hereof. ARTICLE VI PARTNER PROJECTS 6.1 Partner Projects. Each Party may conduct a Partner Project only in accordance with the terms of this Article VI. Except as provided in Sections 6.2 [*] hereof, during the period beginning on December 27, 1999, and ending on the last day of the Term, (a) Medarex represents that it (and Medarex Affiliates) has entered and agrees that it (and its Affiliates) will enter into Project Agreements governing one or more Medarex Partner Projects only with Third Parties Headquartered in the Medarex Primary Promotional Area, and (b) except for that certain Research and Commercialization Agreement effective as of April 15, 2001, entered into by Kirin with Corixa Corporation, Kirin represents that it (and Kirin Affiliates) has entered and agrees that it (and its Affiliates) will enter into Project Agreements governing one or more Kirin Partner Projects only with Third Parties Headquartered in the Kirin Primary Promotional Area. In addition, except as provided in Sections 6.2 and 6.3 hereof, during the period beginning on December 27, 1999, and ending on the last day of the Term Medarex represents that it (and its Affiliates) have entered and agrees that it (and its Affiliates) will enter into Project Agreements governing one or more HuMAb License Projects only with Third Parties Headquartered in the Medarex Primary Promotional Area. The Parties shall discuss in good faith [*], whether the Kirin Primary Promotional Area shall be expanded to include Third Parties Headquartered in Australia and New Zealand, with a corresponding modification to the Medarex Primary Promotional Area. 6.2 Partner Projects Involving Special Relationships. Notwithstanding the terms of Section 6.1 hereof, if a Party (or any of its Affiliates) has a Special Relationship with a Third Party Headquartered in the other Party's Primary Promotional Area, and such Third Party wishes to enter into a Project Agreement that governs one or more Partner Projects, or, in the case of Medarex, one or more [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -64-


 Partner Projects and/or HuMAb License Projects, with the Party (or any of its Affiliates) with which it has the Special Relationship, then the Party (or its Affiliate) with such Special Relationship may enter into such Project Agreement with such Third Party, subject to the written consent of the other Party, which consent shall not be unreasonably withheld. For purposes of clarification, (a) "consent" for purposes of this Section 6.2 shall mean consent by a Party as to the other Party's entering into such Project Agreement governing the Partner Project(s) and/or HuMAb License Project(s), as the case may be, rather than consent as to the form or content of such proposed Project Agreement, and (b) the fact that a Party consents to the other Party's entering into any such Project Agreement with a Third Party shall not make it unreasonable for the Party granting such consent to later withhold its consent to such other Party's entering into a subsequent Project Agreement that governs one or more Partner Project(s) and/or HuMAb License Project(s), as the case may be, with the same Third Party. 6.3 [*] Advertisements or Other Promotions. 6.3.1 In General. Subject to the terms and conditions of Section 6.3.2 hereof, each of Medarex (and its Affiliates) and Kirin (and its Affiliates) may advertise and/or promote the Medarex Mice, Kirin Mice, and KM-Mice, including, without limitation, publishing papers regarding any such technology and presenting any such technology at conferences, anywhere in the world. [*], if [*] advertisement or promotion undertaken by a Party (or any of its Affiliates), such Party (or any of its Affiliates) is [*] by a Third Party Headquartered in the [*] Primary Promotional Area regarding the possibility of entering into a Project Agreement that governs one or more Partner Projects, or, in the case of Medarex, one or more Partner Projects and/or HuMAb License Projects, such Party (or its Affiliate) shall [*] such Third Party that the [*] has [*] with respect to [*] governing such [*], and, in the case of [*] and/or [*], in that [*]; provided, however, that if such [*] with the Party (or its Affiliate) that it [*] and [*], then such [*] may [*] such [*] governing such [*], and, in the case of [*], such [*] and/or [*], with [*], subject to the [*] of the [*], which [*]. For purposes of clarification, (a) [*] for purposes of this Section 6.3.1 shall mean [*] by a Party as to the [*] such [*] governing the [*] and/or [*], as the case may be, [*] as to the [*] of such [*], and (b) the fact that a Party [*] to the [*] any such [*] with a [*] shall [*] for the Party [*] to [*] to such [*] a [*] that governs one or more [*] and/or [*], as the case may be, with the [*]. 6.3.2 Consultation With Respect to Advertising and Promotion. In the event that Medarex (or any of its Affiliates) engages in advertising and/or promotion with respect to the Kirin Mice or the KM-Mice, or Kirin (or any of its Affiliates) engages in advertising or promotion with respect to the Medarex Mice or the KM-Mice, and the other Party objects to such Party's (or its Affiliates) advertising or promotion, such other Party may provide notice thereof to the Party engaging in such advertising or promotion (or whose Affiliate is engaging in such advertising or promotion) and the Parties shall promptly consult in good faith to address and resolve any such reasonable objections relating to such advertising or promotion. 6.4 Partner Opportunities. The Requesting Party may request that the Non-Requesting Party notify one or more of the Non-Requesting Party's Partners that the Requesting Party desires to negotiate with such Partner(s) for Commercialization Rights in the Requesting Party's Primary Promotional Area with respect to Antibody Products directed against Targets to which such Partner(s) has rights under this Agreement. Upon receipt of any notice identifying any such Partner, the Non-Requesting Party shall promptly provide such notice to such Partner and shall provide [*] to the Requesting Party in facilitating the initiation of the negotiation of any such Commercialization Rights between such Partner and the Requesting Party. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -65- 


 6.5 Covenants. 6.5.1 Terms and Conditions of Project Agreements. (a) Third Party Agreements and Grant of Access to Technology. Except as provided in Section 6.5.1(b) hereof, Medarex covenants to Kirin and Kirin covenants to Medarex that during the Term of this Agreement neither it nor its Affiliates will enter into a Project Agreement unless the terms and conditions of the Project Agreement: (i) permit such Party to notify the other Party of the existence of such agreement and the identity of such Third Party, within [*] days after the effective date of such agreement, together with the identity of the Collaboration Mice that are the subject of the License or sublicense; and (ii) in the case of a Project Agreement governing a Partner Project and/or In-House Project, permit such Party to notify the other Party, in the event of any transfer of Collaboration Mice and/or Antibodies or Antibody Materials produced therefrom to such Third Party in connection with such project(s) within [*] days after such transfer, (A) if by Medarex the fact that Kirin Mice or KM-Mice were transferred to such Third Party and/or the fact that Antibodies or Antibody Materials were produced using the Kirin Mice or KM-Mice and such Antibodies and/or Antibody Materials were transferred to such Third Party, or, (B) if by Kirin the fact that Medarex Mice or KM-Mice were transferred to such Third Party and/or the fact that Antibodies or Antibody Materials were produced using the Medarex Mice or KM-Mice were transferred to such Third Party. (b) Antigen Disclosures. Except as provided in this Section 6.5.1(b), Medarex covenants to Kirin and Kirin covenants to Medarex that during the Term neither it nor any of its Affiliates will enter into a Project Agreement governing a Partner Project, which Project Agreement provides for the grant by such Party to a Partner of a sublicense under a Reservation License or a Commercial License with respect to Antibodies raised against and with affinity for a particular Antigen, and/or Antibody Products containing such Antibodies, in each case in connection with such Partner Project, unless the terms and conditions of such Project Agreement permit such Party to notify the other Party of the identity of any such Antigen and the identity of the Partner within [*] days after the earlier of (i) the grant by the contracting Party to the Partner of a sublicense under a Commercial License with respect to such Antigen in connection with such Partner Project, or (ii) public disclosure of the fact that a particular Antibody (or Antibody Product) was developed by the Partner in connection with such Partner Project through use of the non-contracting Party's mice or Technology and/or the KM-Mice or KM Patent Rights, as the case may be. For the avoidance of doubt, if a Third Party will not agree to permit a Party to include in the Project Agreement, terms that satisfy the requirements of Sections 6.5.1(a) and 6.5.1(b), such Party (or its Affiliate) may not enter into the Project Agreement with such Third Party governing a Partner Project; provided, however, that in the case of [*] (or a [*] Affiliate, as permitted under Section 8.5.3 to the extent applicable) as the contracting Party, [*] or its Affiliate [*] a [*] governing a [*] or [*] with a Third Party which [*] after [*] to have [*], but [*], in that or any other agreement or legally binding understanding, [*] such Third Party [*] or other [*] the [*] unless the Third Party [*]. Notwithstanding the foregoing, in the event that Medarex, after [*], is [*] the agreement of a Third Party to [*] such [*] to [*] in accordance with this Section 6.5.1(b), it shall not be deemed a [*] to [*] to [*] such [*] and Kirin shall [*] to [*] or otherwise bring [*] for [*] to [*] the Third Party the [*] such [*] or for [*] a [*] governing a [*] or [*] with the Third Party [*] such [*] to the [*] of such [*]; provided, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -66-


 however, that nothing herein is intended to limit [*], if any, or [*], if any, with respect to the [*] of any other [*] or [*] in this Agreement, including without limitation, [*] of a [*] or other [*] the [*] to a Third Party which [*]. For the avoidance of doubt, for purposes of this Section 6.5.1(b), Medarex shall [*] to [*] the [*] in the [*] of such [*]." 6.5.2 Project Agreement Disclosure Requirements. (a) Third Party Agreements and Grant of Access to Technology. Except as provided in Section 6.5.2(b), Medarex covenants to Kirin and Kirin covenants to Medarex that during the Term it shall provide written notice to the other Party with respect to Project Agreements entered into during the Term as follows: (i) the existence of such agreement and identity of such Third Party, within thirty (30) days after the effective date of such agreement, together with the identity of the Collaboration Mice that are the subject of the License or sublicense; and (ii) in the case of a Project Agreement governing a Partner Project and/or In-House Project, in the event of any transfer of Collaboration Mice and/or Antibodies or Antibody Materials produced therefrom to such Third Party in connection with such project(s) within [*] days after such transfer, (A) if by Medarex the fact that Kirin Mice or KM-Mice were transferred to such Third Party and/or the fact that Antibodies or Antibody Materials were produced using the Kirin Mice or KM-Mice and such Antibodies and/or Antibody Materials were transferred to such Third Party, or, (B) if by Kirin the identity of Medarex Mice or KM-Mice and/or the fact that Antibodies or Antibody Materials as were produced using the Medarex Mice or KM-Mice and transferred to such Third Party. (b) Antigen Disclosures. During the Term of this Agreement, if a Party desires to know the [*] of an [*] for which a particular [*] has [*] a [*] a [*] or a [*] with respect to [*], and/or [*], in each case in connection with such Partner Project, such Party shall provide written notice thereof to the other Party within [*] days after the receipt of such notice from the other Party disclosing the identity of such Partner pursuant to Section 6.5.2(a) hereof. From and after the receipt of such notice from the non-contracting Party, the contracting Party shall notify the non-contracting Party of the identity of any such Antigen and the identity of such Partner within [*] days after the earlier of (i) the grant by the contracting Party to the Partner of a sublicense under a Commercial License with respect to such Antigen in connection with such Partner Project, or (ii) public disclosure of the fact that a particular Antibody (or Antibody Product) was developed by the Partner in connection with such Partner Project through use of the non-contracting Party's mice or Technology and/or KM-Mice or KM Patent Rights, as the case may be. Notwithstanding the foregoing, in the event that Medarex, [*] is [*] the agreement of a Third Party [*] in accordance with this Section 6.5.2(b), it shall not be deemed a [*] to [*] to [*] such [*] and Kirin shall [*] or otherwise bring [*] for [*] or [*] to [*] the Third Party the [*] such [*] or for [*] a [*] governing a [*] or [*] with the Third Party [*] such [*] to the [*] of such [*]; provided, however, that nothing herein is intended to limit [*], if any, or [*], if any, with respect to the [*] of any other [*] or [*] in this Agreement, including without limitation, [*] a [*] or other [*] the [*] to a Third Party which [*]. For the avoidance of doubt, for purposes of this Section 6.5.2(b), [*] shall [*] to [*] to the Third Party in the [*] of such [*] 6.5.3 [*] The disclosure of information pursuant to Section 6.5.2 hereof shall be subject to the terms and conditions of [*] hereof. Each Party represents, warrants, and covenants to the other Party that it will [*] information provided to it by the other Party pursuant to Section 6.5.2 hereof, and will [*] such information. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -67-


 6.5.4 [*] regarding HuMAb Collaboration Project. Medarex shall not enter into, or amend or modify, an agreement with one or more Medarex Affiliates or Third Parties such that such agreement would be deemed to provide for the conduct of a HuMAb Collaboration Project if Medarex's [*]. In the event that Medarex enters into, amends, or modifies such an agreement in breach of the [*] contained in this Section 6.5.4, such project shall be deemed a [*] for purposes of this Agreement. 6.6 [*] of Collaboration Mice to Partners. Medarex agrees that, from and after the Effective Date, at the time it offers to a Partner or prospective Partner an opportunity to obtain a license (or a sublicense) to use the KM-Mice and/or Medarex Mice, Medarex shall [*] such Person that such Person may [*] from [*] a [*] (or a [*]) to [*] the [*] (provided that [*] shall be obligated to so [*] such Person with respect to [*]) and, if [*] the [*] were [*], the [*] and [*], in each case on terms that are [*] the terms on which [*] to such Person the [*] to [*] the [*] (or [*]) to [*] the [*]. Kirin agrees that, from and after the Effective Date, at the time it offers to a Partner or prospective Partner an opportunity to obtain a license (or a sublicense) to use the KM-Mice, TC Mice and/or HAC Mice, Kirin shall [*] such [*] that such [*] may also [*] from [*] a [*] (or a [*]) to [*] the [*] and, if [*] were [*], the [*] and [*], in each case on terms that are [*] the terms on which [*] to such Person the [*] to [*] the [*] (or [*]) to [*] the [*], as the case may be. Notwithstanding the foregoing, a Party may relieve the other Party of such other Party's affirmative obligations pursuant to this Section 6.6 [*] by delivering to such other Party written notice thereof (which notice may be revoked by subsequent written notice from the original notifying Party to the other Party reinstating such obligation(s) pursuant to this Section 6.6 effective no earlier than [*] days following the delivery of such notice). ARTICLE VII CHANGE IN STATUS OF IN-HOUSE PROJECT OR PARTNER PROJECT 7.1 Change in Rights Related to Target Designated for In-House Project. 7.1.1 In General. If at any time after a Party has designated a Target on its In-House Target List in connection with an In-House Project, the Party designating the Target (or the Affiliate of such Party, in the case of In-House Projects involving such Party's Affiliate) desires to effect an In-House Project Status Change, such Party (or its Affiliate, as the case may be) shall be permitted to effect such change only if such Party complies with this Section 7.1 and provides to the other Party (a) prior written notice of such proposed change; and (b) prompt written notice following implementation of such change, indicating the In-House Project Status Change Date. 7.1.2 Requirements for In-House Project Status Change. In the event that a Party has designated a Target (in accordance with Article V hereof) as an In-House Target in connection with a project and the Party and/or such Party's Affiliate Opts Out with respect to such Target [*], from and after the In-House Project Status Change Date, the project shall nevertheless continue to be an In-House Project such that (a) the Primary Promotional Area restrictions set forth in Section 6.1 hereof shall not apply, and (b) such Target shall continue to [*] unless and until one of the conditions in clause (a) of Section 5.5 hereof has been satisfied with respect to such Target. 7.1.3 Designation of Targets In Connection With In-House Project Status Change. For purposes of Section 7.1.2, if prior to the In-House Project Status Change Date the Party seeking to implement such change has not yet designated the Target as a [*] Target or a [*] Target pursuant to Article V hereof, such Party shall designate the Target as either a [*] Target or a [*] Target in the notice provided to the other Party pursuant to Section 7.1.1 hereof, and such designation (i.e., as either a [*] Target or a [*] Target) shall continue to apply with respect to the Designating Party's obligations under [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -68-


 [*] hereof. If prior to the In-House Project Status Change Date with respect to such project, the Party seeking to implement such change has designated the Target as a [*] Target or a [*] Target pursuant to Article V hereof, such designation shall continue to apply with respect to the Designating Party's obligations under [*] hereof, unless and until, with respect to a Target designated as a [*] Target, such Designating Party redesignates such [*] Target as a [*] Target pursuant to Section 5.3.1 hereof. 7.1.4 Covenant Regarding Change in Nature of In-House Project Rights. Neither Party shall initially enter into a Project Agreement with respect to an In-House Project and later effect (or attempt to effect) an In-House Project Status Change with respect to such In-House Project pursuant to Section 7.1.2 hereof, if such Party's [*] in structuring such project as an In-House Project and later effecting (or attempting to effect) an In-House Project Status Change was [*] set forth in Section [*] hereof or such Party's [*]. 7.2 Change in Rights Related to Target Selected for Partner Project. 7.2.1 In General. If at any time after a Party who has exercised its rights under a License with respect to a particular Target desires to effect a Partner Project Status Change to convert the project to an In-House Project, such Party shall be permitted to effect such change and convert the project to an In-House Project only if such Party has not, and will not as a result of effecting such change, [*] for In-House Projects. In the event that such change would result in such Party [*], such Party may not effect such change in the nature of its rights unless such Party designates such Target as a [*] Target pursuant to Section 7.2.2 hereof and within [*] days after the Partner Project Status Change Date [*]. 7.2.2 Requirements for Conversion. If a Party is permitted to convert a Partner Project to an In-House Project pursuant to Section 7.2.1 hereof, it may do so only if it provides to the other Party (a) prior written notice of such proposed change; and (b) prompt written notice following implementation of such change, indicating the Partner Project Status Change Date. As part of such notice, the notifying Party shall designate the Target as either a [*] Target pursuant to Section 5.2 hereof or a [*] Target pursuant to Section 5.3 hereof. From and after the Partner Project Status Change Date, the project shall be treated as an In-House Project for purposes of this Agreement, including, without limitation, the terms and conditions of [*] hereof; provided, however, that in the event that the Designating Party designates the Target as a [*] Target, it shall be required to [*] the Partner Project Status Change Date. If one or more [*] has already occurred with respect to such Target as of the Partner Project Status Change Date, [*]. Upon the conversion of a Partner Project to an In-House Project pursuant to this Section 7.2, the Party making such conversion shall [*] thereunder. ARTICLE VIII GRANTS OF LICENSES 8.1 Present Grants of Licenses. The intent and effect of the grant of each License in this Article VIII is to create a present license grant and right in favor of the licensee Party as to such License, subject to the terms and conditions of this Agreement. Subject to any contrary and nonwaivable requirements of applicable law, the Parties intend for the license grants herein to be construed in a manner which preserves (to the maximum extent) for the licensee Parties each of the benefits of the bargain set forth in this Agreement, rather than in a manner that may leave the provision voidable, rejectable or otherwise terminable or unenforceable by operation of applicable law. Without limitation of the foregoing, the Parties intend that the rights of a non-debtor Party should survive to the maximum extent permitted by applicable law, notwithstanding a rejection of this Agreement by a debtor Party pursuant to Section 365 of the Bankruptcy Code or pursuant to the Japanese bankruptcy law, as applicable. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -69- 


 8.2 Medarex Licenses to Kirin. 8.2.1 Breeding License. Subject to Sections 8.2.5 and 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), fully paid up, royalty-free, worldwide, perpetual (subject to any rights of termination provided in this Agreement) right and license, with rights to sublicense as permitted under Section 8.5.1(a) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to research, develop, breed or otherwise make or manipulate, use, import, and export (but not to sell, offer to sell, lease, offer to lease, or otherwise transfer title to) Collaboration Mice at any and all of Kirin's (or any Kirin Affiliate's) facilities anywhere in the world, including, without limitation, subject to Section 8.5.1(a) hereof, the facilities of a Third Party contract service provider to which Kirin contracts out the maintenance, propagation and/or manipulation of Collaboration Mice in connection with a Services Project. Kirin acknowledges that Article IX hereof governs the availability and transfer of Medarex Materials that may, but need not, be used by Kirin and its sublicensees in the enjoyment of the right and license granted by Medarex to Kirin in this Section 8.2.1. 8.2.2 Evaluation License. Subject to Sections 8.2.5 and 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), fully paid up, royalty-free, worldwide, perpetual (subject to any rights of termination provided in this Agreement), right and license, with rights to sublicense as permitted under Section 8.5.1(b) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to immunize Collaboration Mice to raise Antibodies (and Antibody Materials related thereto) against, and with affinity for, Antigens, and to use Mice Materials derived from any Collaboration Mice to generate Antibodies and/or to evaluate such Antibodies, in each case solely for research purposes (but not for clinical development), and to determine whether Kirin desires to exercise its rights under a Reservation License or Commercial License with respect to any such Antibodies, Antibody Materials related thereto, or Antibody Products containing such Antibodies, and/or whether any of Kirin's Affiliates, Partners or In-House Collaborators desires to acquire a sublicense under any such License. 8.2.3 Reservation Licenses. On a Kirin Reservation Target by Kirin Reservation Target basis, with respect to each Kirin Reservation Target, subject to Sections 8.2.5 and 8.11 hereof and the other the terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), royalty-free, worldwide right and license during the Reservation License Period for such Kirin Reservation Target, with rights to sublicense as permitted under Section 8.5.1(c) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to immunize Collaboration Mice to raise Antibodies (and Antibody Materials related thereto) against, and with affinity for, such Kirin Reservation Target, and to use Mice Materials derived from any Collaboration Mice to generate Antibodies and/or to evaluate such Antibodies, in each case solely for research purposes (but not for clinical development), and to determine whether Kirin desires to exercise its rights under a Commercial License with respect to such Kirin Reservation Target pursuant to Section 4.3 hereof and/or whether any of Kirin's Affiliates, Partners, or In-House Collaborators desires to acquire a sublicense under any such Commercial License. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -70- 


 8.2.4 Commercial Licenses. (a) Antigen Exclusive Commercial Licenses. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Kirin Exclusive Commercial Target pursuant to Sections 4.4.1(b) and 4.4.2 hereof, subject to Sections 8.2.5, 8.2.7(b), 8.2.7(c), 8.2.7(d), 8.2.8(b), 8.2.8(c), and 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a worldwide, exclusive (even as to Medarex), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement), right and license, with rights to sublicense as permitted under Section 8.5.1(d) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Material related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). Medarex represents, warrants and covenants to Kirin that, except as provided in Section 8.2.7 or 8.2.8 hereof, Kirin shall have rights of exclusivity as set forth in the preceding sentence and none of Medarex or its assignees or successors shall grant or shall have granted to any other Person any license or other right to Exploit and/or have Exploited (which in the case of past grants shall refer to a license or other right that remains in effect), (x) Antibodies (and Antibody Materials related thereto) raised against and with affinity for the Kirin Exclusive Commercial Target against which such Selected Antibody(ies) was raised, or (y) Antibody Products containing Antibodies (and Antibody Materials related thereto) raised against and with affinity for such Kirin Exclusive Commercial Target. (b) Antigen Non-Exclusive Commercial Licenses. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Kirin Non-Exclusive Commercial Target pursuant to Sections 4.4.1(a) and 4.4.2 hereof, subject to Sections 8.2.5, 8.2.7(b), 8.2.7(c), 8.2.7(d), 8.2.8(b), 8.2.8(c), and 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a worldwide, exclusive (even as to Medarex), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement), right and license, with rights to sublicense as permitted under Section 8.5.1(d) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Material related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). For the avoidance of doubt, nothing contained in this Section 8.2.4(b) shall prohibit Medarex from granting to any other Person a license to Exploit and/or have Exploited Antibodies (and Antibody Materials related thereto), other than such Selected Antibody(ies), raised against and with affinity for such Kirin Non-Exclusive Commercial Target. (c) Antigen Semi-Exclusive Commercial License. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Kirin Semi-Exclusive Commercial Target pursuant to Sections 4.4.1(b) and 4.4.2 hereof, subject to Sections 8.2.5, 8.2.7(a), 8.2.7(b), 8.2.7(c), 8.2.7(d), 8.2.8(a), 8.2.8(b), 8.2.8(c), and 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin, and Kirin hereby accepts, a worldwide, exclusive (subject specifically to Sections 8.2.7(a) and 8.2.8(a)) (even as to Medarex), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement), right and license, with rights to sublicense as permitted under Section 8.5.1(d) hereof, under the Medarex Technology and Medarex's interest in the KM Patent Rights and KM Know-How, and any Medarex Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Material related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). Medarex represents, warrants and [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -71- 


 covenants to Kirin that, except as provided in Section 8.2.7 or 8.2.8 hereof, Kirin shall have rights of exclusivity as set forth in the preceding sentence and none of Medarex, its assignees, or successors shall grant or shall have granted to any other Person any license or other right to Exploit and/or have Exploited (which in the case of past grants shall refer to a license or other right that remains in effect), (x) Antibodies (and Antibody Materials related thereto) raised against and with affinity for the Kirin Semi-Exclusive Commercial Target against which such Selected Antibody(ies) was raised, or (y) Antibody Products containing Antibodies (and Antibody Materials related thereto) raised against and with affinity for such Kirin Semi-Exclusive Commercial Target. 8.2.5 Sublicenses Under Medarex In-License Agreements. (a) In General. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, including this Section 8.2.5, with respect to any Medarex Technology that Medarex Controls pursuant to licenses granted to Medarex by Third Parties in any Medarex In-License Agreements, the licenses granted by Medarex to Kirin in Sections 8.2.1, 8.2.2, 8.2.3 and 8.2.4 hereof shall include sublicenses under such Medarex Technology (with the rights for Kirin to grant further sublicenses only as permitted in Sections 8.5.1 hereof) (i) for the same scope and field of use, with the same degree of exclusivity (i.e., non-exclusive, exclusive, or semi-exclusive), and with respect to the same Selected Antibodies, Antibody Materials and Collaboration Products as specified in the relevant license grant in Sections 8.2.1, 8.2.2, 8.2.3 and 8.2.4, as applicable, (ii) subject to the same pre-existing grants and retained rights as apply to the corresponding grants in Sections 8.2.1, 8.2.2, 8.2.3 and 8.2.4 hereof, as applicable, and (iii) on the terms and conditions that apply under the applicable Medarex In-License Agreement to the exercise by any of Medarex's sublicensee(s) of such sublicense(s) (excluding any payment-related terms thereof unless otherwise expressly provided in Article X hereof), provided, however, that clause (iii) hereof shall in no way affect the warranty made by Medarex to Kirin under Section 8.5.1(d)(ii). (b) DNX Agreement. The sublicense granted by Medarex to Kirin under the DNX Agreement in Section 8.2.5(a) hereof shall include a sublicense for the right to (i) [*]; provided, however, that the sublicense granted to Kirin by Medarex under the DNX Agreement shall [*]. The terms [*] shall have the meanings set forth on Exhibit B hereto. (c) MRC Agreement. The sublicense granted by Medarex to Kirin under the MRC Agreement in Section 8.2.5(a) hereof shall include a sublicense under all of the license rights granted to Medarex in [*] of the MRC Agreement, except that Medarex [*] (as that term is defined in the MRC Agreement) [*]. (d) Notice to Medarex. In the event that Kirin grants to an Affiliate, Partner or In-House Collaborator, pursuant to Article VIII hereof and the other terms and conditions of this Agreement, any sublicense or other rights under any Medarex In-License Agreement(s), Kirin shall provide to Medarex written notice thereof within [*] business days of such grant by Kirin, which notice shall identify such Person and the Medarex In-License Agreement(s) with respect to which such sublicense or other rights were granted by Kirin. 8.2.6 Trademark License Granted by Medarex to Kirin. (a) Grant. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Medarex hereby grants to Kirin a limited, worldwide, non-exclusive, non-assignable, royalty-free, right and license during the Term, with rights to sublicense as permitted under Section 8.5.1(f), to use the Medarex Trademarks and the KM Trademarks in connection with the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -72- 


 Exploitation of the Medarex Mice, Medarex Technology, KM-Mice, KM Patent Rights, KM Know-How, Collaboration Antibodies, and/or Collaboration Products in accordance with the terms and conditions of this Agreement, in accordance with Medarex's corporate identity and trademark use guidelines as may be provided in writing by Medarex to Kirin from time to time, and (i) as required by applicable law; (ii) as reasonably necessary for the exercise of rights granted to Kirin pursuant to Section 6.3.1 hereof; or (iii) otherwise as agreed in writing by Medarex, such agreement not to be unreasonably withheld. (b) Quality Control. Subject to Section 8.11 hereof, Kirin, upon written request of Medarex, shall promptly furnish Medarex with representative samples showing use of the Licensed Trademarks by Kirin (and any of its Affiliates and sublicensees) and, upon written notification from Medarex, shall cease, or modify in accordance with Medarex's reasonable instructions (or cause Kirin Affiliates and sublicensees to cease, or modify in accordance with Medarex's reasonable instructions), any use of the Licensed Trademarks that Medarex reasonably deems not to be in compliance with its permitted and reasonable standards and any applicable laws and regulations. (c) Covenants Relating to Use of Trademarks. Kirin represents, warrants and covenants that, it will not (i) use any Medarex Trademarks or any part thereof as part of Kirin's corporate name; (ii) use any new Trademark confusingly similar to the Medarex Trademarks; or (iii) hereafter register in any country any Trademark resembling or confusingly similar to the Medarex Trademarks. 8.2.7 Licenses Subject to Pre-Existing Grants. (a) Each Kirin Antigen Semi-Exclusive Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4(c) hereof with respect to a particular Kirin Semi-Exclusive Commercial Target shall be subject to any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Medarex prior to the Effective Date to a Third Party under the Medarex Technology and Medarex's interests in the KM Patent Rights or KM Know-How with respect to one or more Antibodies (which Antibodies in the case of an existing grant of license shall be listed on the Antibody Sequence List pursuant to Article II hereof) against the Antigen with respect to which rights are granted in the Kirin Antigen Semi-Exclusive Commercial License. (b) Each Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4 hereof shall be subject to any exercise of rights by Medarex prior to the Effective Date, and any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Medarex prior to the Effective Date to Kirin or a Third Party under the Medarex Technology and Medarex's interests in the KM Patent Rights and/or KM Know-How to Exploit Antibodies (and Antibody Materials related thereto) with affinity for the Antigen that is the subject of the Commercial License but raised against another Antigen (which Antigen in the case of an existing license shall be listed on an Antigen List pursuant to Article II hereof). (c) Each Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4 hereof shall be subject to any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Medarex prior to the Effective Date to Kirin or a Third Party under the Medarex Technology and Medarex's interests in the KM Patent Rights and/or KM Know-How to perform research and to determine whether such licensee desires to acquire a license under such technology with respect to Antibodies (and Antibody Materials related thereto) raised against and with affinity for Antigens and/or Antibody Products containing Antibodies (and Antibody Materials related thereto). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -73-


 (d) The Parties acknowledge and agree that pursuant to the Cross License Agreement, a copy of which has been provided to Kirin, Medarex has granted a worldwide, non-exclusive license under the Patent Rights (as the term is defined and used under the Cross License Agreement) to use for research, and to develop, make, have made, use, import, export or otherwise transfer physical possession of, sell, lease, offer to sell or lease, or otherwise transfer title to Antibody Products (as defined in the Cross License Agreement). (e) Notwithstanding anything else contained in this Agreement, in the event that Medarex grants to Kirin a license (or a sublicense) in Section 8.2 hereof or Medarex grants to a Kirin Affiliate, Kirin Partner or Kirin In-House Collaborator a license (and/or a sublicense) in a Direct Sublicense Agreement, which license (and/or sublicense) is [*], Medarex shall [*] in the Field under such Technology and/or Medarex's interest in the KM Patent Rights and/or KM Know-How, as the case may be, with respect to the relevant antibody(ies) in the relevant country(ies). Pursuant to Section 14.4 hereof [*] with respect thereto whether or not [*], and pursuant to Section [*] hereof, Medarex shall not [*]. This Section 8.2.7(e) shall not apply to grants of [*] by Medarex from and after the Effective Date of its obligations to (a) follow the procedures set forth in Section 2.3 hereof with respect to (i) the listing of Antigens on any Antigen Lists that Medarex has an obligation to maintain pursuant to Section 2.1.1 hereof, or (ii) the listing of Antibodies on the Antibody Sequence List; or (b) respond to (i) Antigen Availability Inquiries pursuant to Section 3.3 hereof, or (ii) Antibody Availability Inquiries pursuant to Section 3.5 hereof, with respect to which [*]. 8.2.8 Retained Rights. (a) Notwithstanding anything in Section 8.2 of this Agreement to the contrary, in the case of each Kirin Antigen Semi-Exclusive Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4(c) hereof, Medarex hereby retains the right to (i) grant licenses, options, or rights of refusal or negotiation under the Medarex Technology and Medarex's interests in the KM Patent Rights and KM Know-How to Medarex's Affiliates, Kirin, and Third Parties, to Exploit one or more Antibodies (and/or Antibody Products containing such Antibodies) raised against and with affinity for the Antigen that is the subject of such Antigen Semi-Exclusive Commercial License in effect pursuant to any agreement entered into prior to the date on which the Antigen Semi-Exclusive Commercial License is first exercised in accordance with the terms and conditions of Article IV hereof, and (ii) exercise its rights under its Technology to Exploit one or more Antibodies (and/or Antibody Products containing such Antibodies) raised against and with affinity for the Antigen that is the subject of such Antigen Semi-Exclusive Commercial License, in each case, in connection with an active research, development and/or commercialization project of Medarex, which Medarex can demonstrate, based on its written records and the information contained on the Medarex Non-Exclusive Antigen List, was commenced consistent with the terms of this Agreement before the date on which such Antigen Semi-Exclusive Commercial License is exercised in accordance with the terms and conditions of Article IV hereof; provided, however, that Medarex does not retain the rights provided in clause (i) or (ii) of this Section 8.2.8(a) with respect to any [*] for such License. (b) Notwithstanding anything in Section 8.2 of this Agreement to the contrary, in the case of each Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4 hereof, Medarex hereby retains the right to Exploit, and to grant licenses, options, or rights of refusal or negotiation under the Medarex Technology and its interest in the KM Patent Rights and KM Know-How to Medarex Affiliates, Kirin, and Third Parties, to Exploit, Antibodies with affinity for the Antigen that is the subject of the Commercial License, but raised against another Antigen. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -74-


 (c) Except as provided in Section 8.6.1(a) hereof, notwithstanding anything in this Agreement to the contrary, in the case of each Commercial License granted by Medarex to Kirin pursuant to Section 8.2.4 hereof, Medarex hereby retains the right under the Medarex Technology and Medarex's interests in the KM Patent Rights and KM Know-How, to immunize, and to grant to its Affiliates, Kirin, and Third Parties rights to immunize, any Collaboration Mice to raise Antibodies against Antigens for research purposes and to determine whether Medarex or such licensee or sublicensee, as the case may be, desires to retain or acquire a license (or a sublicense) with respect to any such Antibodies or Antigens. 8.3 Kirin Licenses to Medarex. 8.3.1 Breeding License. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex and Medarex hereby accepts a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), fully paid-up, royalty-free, perpetual (subject to any rights of termination provided in this Agreement), worldwide right and license, with rights to sublicense as permitted under Section 8.5.2(a), under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to research, develop, breed or otherwise make or manipulate, use, import, and export (but not to sell, offer to sell, lease, offer to lease, or otherwise transfer title to) Collaboration Mice at any and all of Medarex's (or a Medarex Affiliate's) facilities anywhere in the world, including, without limitation, subject to Section 8.5.2(a) hereof, the facilities of a Third Party contract service provider to which Medarex contracts out the maintenance, propagation, and/or manipulation of Collaboration Mice in connection with a Services Project. Medarex acknowledges that Article IX hereof governs the availability and transfer of Kirin Materials that may, but need not, be used by Medarex and its sublicensees in the enjoyment of the right and license granted by Kirin to Medarex in this Section 8.3.1. 8.3.2 Evaluation License. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex, and Medarex hereby accepts, a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), fully paid up, royalty-free, worldwide, perpetual (subject to any rights of termination provided in this Agreement) right and license, with rights to sublicense as permitted under Section 8.5.2(b) hereof, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to immunize Collaboration Mice to raise Antibodies (and Antibody Materials related thereto) against, and with affinity for, Antigens, and to use Mice Materials derived from any Collaboration Mice to generate Antibodies and/or to evaluate such Antibodies, in each case solely for research purposes (but not for clinical development), and to determine whether Medarex desires to exercise its rights under a Reservation License or Commercial License with respect to any such Antibodies, Antibody Materials related thereto, or Antibody Products containing such Antibodies, and/or whether any of Medarex's Affiliates, Partners or In-House Collaborators desires to acquire a sublicense under any such License. 8.3.3 Reservation Licenses. On a Medarex Reservation Target by Medarex Reservation Target basis, with respect to each Medarex Reservation Target, subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex, and Medarex hereby accepts, a non-exclusive, non-transferable (except pursuant to Section 18.4 hereof), royalty-free, worldwide right and license during the Reservation License Period for such Medarex Reservation Target, with rights to sublicense as permitted under Section 8.5.2(c) hereof, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to immunize Collaboration Mice to raise Antibodies (and Antibody Materials related thereto) against, and with affinity for, such Medarex Reservation Target, and to use Mice Materials derived from any Collaboration Mice to generate Antibodies and/or to evaluate such Antibodies, in each case solely for [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -75-


 research purposes (but not for clinical development), and to determine whether Medarex desires to exercise its rights under a Commercial License with respect to such Medarex Reservation Target pursuant to Section 4.3 hereof and/or whether any of Medarex's Affiliates, Partners or In-House Collaborators desires to acquire a sublicense under any such Commercial License. 8.3.4 Commercial License. (a) Antigen Exclusive Commercial License. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Medarex Exclusive Commercial Target pursuant to Sections 4.4.1(b) and 4.4.2 hereof, subject to Sections 8.3.8(b), 8.3.8(c), 8.3.9(b), 8.3.9(c), and 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex, and Medarex hereby accepts, a worldwide, exclusive (even as to Kirin), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement) right and license, with rights to sublicense as permitted under Section 8.5.2(d) hereof, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Materials related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). Kirin represents, warrants and covenants to Medarex that, except as provided in Section 8.3.8 or 8.3.9 hereof, Medarex shall have rights of exclusivity as set forth in the preceding sentence and none of Kirin, its assignees or successors shall grant or shall have granted to any other Person any license or other right to Exploit and/or have Exploited (which in the case of past grants shall refer to a license or other right that remains in effect), (x) Antibodies (and Antibody Materials related thereto) raised against and with affinity for the Medarex Exclusive Commercial Target against which such Selected Antibody(ies) was raised, or (y) Antibody Products containing Antibodies (and Antibody Materials related thereto) raised against and with affinity for such Medarex Exclusive Commercial Target. (b) Antigen Non-Exclusive Commercial License. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Medarex Non-Exclusive Commercial Target pursuant to Sections 4.4.1(a) and 4.4.2 hereof, subject to Sections 8.3.8(b), 8.3.8(c), 8.3.9(b), 8.3.9(c), and 8.11 hereof and the other the terms and conditions of this Agreement, Kirin hereby grants to Medarex, and Medarex hereby accepts, a worldwide, exclusive (even as to Kirin), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement), right and license, with rights to sublicense as permitted under Section 8.5.2(d) hereof, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Material related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). For the avoidance of doubt, nothing contained in this Section 8.3.4(b) shall prohibit Kirin from granting to any other Person a license to Exploit and/or have Exploited Antibodies (and Antibody Materials related thereto), other than such Selected Antibody(ies), raised against and with affinity for such Medarex Non-Exclusive Commercial Target. (c) Antigen Semi-Exclusive Commercial License. On a Selected Antibody-by-Selected Antibody basis, with respect to [*] with respect to each Medarex Semi-Exclusive Commercial Target pursuant to Sections 4.4.1(b) and 4.4.2 hereof, subject to Sections 8.3.8(a), 8.3.8(b), 8.3.8(c), 8.3.9(a), 8.3.9(b), 8.3.9(c), and 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex, and Medarex hereby accepts, a worldwide, exclusive (subject specifically to Sections 8.3.8(a) and 8.3.9(a)) (even as to Kirin), non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing, perpetual (subject to any rights of termination provided in this Agreement), right [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -76-


 and license, with rights to sublicense as permitted under Section 8.5.2(d) hereof, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to Exploit and/or have Exploited in the Field (i) such Selected Antibody (and Antibody Material related thereto), and/or (ii) Collaboration Products containing such Selected Antibody(ies) (and Antibody Materials related thereto). Kirin represents, warrants and covenants to Medarex that, except as provided in Section 8.3.8 or 8.3.9 hereof, Medarex shall have rights of exclusivity as set forth in the preceding sentence and none of Kirin, its assignees or successors shall grant to any other Person any license or other right to Exploit and/or have Exploited (which in the case of past grants shall refer to a license or other right that remains in effect), (x) Antibodies (and Antibody Materials related thereto) raised against and with affinity for the Medarex Semi-Exclusive Commercial Target against which such Selected Antibody(ies) was raised, or (y) Antibody Products containing Antibodies (and Antibody Materials related thereto) raised against and with affinity for such Medarex Semi-Exclusive Commercial Target. 8.3.5 Sublicenses Under Kirin In-License Agreements. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, including this Section 8.3.5, with respect to any Kirin Technology that Kirin Controls pursuant to licenses granted to Kirin by Third Parties in any Kirin In-License Agreements, if any, the licenses granted by Kirin to Medarex in Section 8.3.1, 8.3.2, 8.3.3 and 8.3.4 hereof shall include sublicenses under such Kirin Technology (with the rights for Medarex to grant further sublicenses) (a) for the same scope and field of use, with the same degree of exclusivity (i.e., non-exclusive, exclusive, or semi-exclusive), and with respect to the same Selected Antibodies, Antibody Materials and Collaboration Products as specified in the relevant license grant in Sections 8.3.1, 8.3.2, 8.3.3 and 8.3.4, as applicable, (b) subject to the same pre-existing grants and retained rights as apply to the corresponding grants in Sections 8.3.1, 8.3.2, 8.3.3 and 8.3.4 hereof, as applicable, and (c) on the terms and conditions that apply under the applicable Kirin In-License Agreement, if any, to the exercise of such sublicense (excluding any payment-related terms thereof). 8.3.6 License Grants Relating to Special Licenses. On a Special License-by-Special License basis, subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex and Medarex hereby accepts a worldwide, non-transferable (except pursuant to Section 18.4 hereof), royalty-bearing right and license, which license is granted to Medarex for the sole purpose of permitting Medarex to provide sublicense rights under such license to the Special Licensee, with rights for the Special Licensee to grant further sublicenses as provided in the applicable Special License, under the Kirin Technology and Kirin's interest in the KM Patent Rights and KM Know-How, and any Kirin Improvements to any of the foregoing, to Exploit and/or have Exploited Selected Antibodies against Antigens, in each case for the same scope and field of use, with the same degree of exclusivity with respect to any such Antigen (i.e., non-exclusive, exclusive, or semi-exclusive), and for the same license term as applies with respect to the licenses granted by Medarex to such Special Licensee in the Special License with respect to Patent Rights Controlled by Medarex and only to the extent that (a) the terms and conditions of such Special Licenses include within the scope of the licenses or other rights granted by Medarex to such Special Licensee a license or other grant of rights with respect to Kirin Mice, Kirin Technology, KM-Mice, KM Patent Rights, and/or KM Know-How, and (b) in the case of Special License No. 3 and Special License No. 4, [*] (i) are identified on in a writing delivered by Medarex to Kirin with respect to this Section 8.3.6 on the date of execution of this Agreement, and/or (ii) are [*] granted by Medarex to a Special Licensee in Special License No. 1 or Special License No. 2. 8.3.7 Trademark License Granted by Kirin to Medarex. (a) Grant. Subject to Section 8.11 hereof and the other terms and conditions of this Agreement, Kirin hereby grants to Medarex a limited, worldwide, non-exclusive, non-assignable, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -77-


 royalty-free, right and license during the Term, with rights to sublicense as permitted under Section 8.5.2(e), to use the Kirin Trademarks and the KM Trademarks in connection with the Kirin Mice, Kirin Technology, KM-Mice, KM Patent Rights, KM Know-How, Collaboration Antibodies, and/or Collaboration Products in accordance with the terms and conditions of this Agreement, in accordance with Kirin's corporate identity and trademark use guidelines as may be provided in writing by Kirin to Medarex from time to time, and (i) as required by applicable law; (ii) as reasonably necessary for the exercise of rights granted to Medarex pursuant to Section 6.3.1 hereof; or (iii) otherwise as agreed in writing by Kirin, such agreement not to be unreasonably withheld. (b) Quality Control. Medarex, upon written request of Kirin, shall promptly furnish Kirin with representative samples showing use of the Licensed Trademarks by Medarex (and any of its Affiliates and sublicensees) and, upon written notification from Kirin, shall cease, or modify in accordance with Kirin's reasonable instructions (or cause Kirin Affiliates and sublicensees to cease, or modify in accordance with Kirin's reasonable instructions), any use of the Licensed Trademarks that Kirin reasonably deems not to be in compliance with its permitted and reasonable standards and any applicable laws and regulations. (c) Covenants Relating to Use of Trademarks. Medarex represents, warrants and covenants that, it will not (i) use any Kirin Trademarks or any part thereof as part of Medarex's corporate name; (ii) use any new Trademark confusingly similar to the Kirin Trademarks; or (iii) hereafter register in any country any Trademark resembling or confusingly similar to the Kirin Trademarks. 8.3.8 Licenses Subject to Pre-Existing Grants. (a) Each Medarex Antigen Semi-Exclusive Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4(c) hereof with respect to a particular Medarex Semi-Exclusive Commercial Target shall be subject to any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Kirin prior to the Effective Date under the Kirin Technology and Kirin's interests in the KM Patent Rights and/or KM Know-How with respect to one or more Antibodies (which Antibodies in the case of an existing grant of license shall be listed on the Antibody Sequence List pursuant to Article II hereof) against the Antigen with respect to which rights are granted in the Medarex Antigen Semi-Exclusive Commercial License. (b) Each Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4 hereof shall be subject to any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Kirin prior to the Effective Date to Medarex or a Third Party of a license, options, or rights of refusal or negotiation under the Kirin Technology and Kirin's interests in the KM Patent Rights and/or KM Know-How to Exploit Antibodies (and Antibody Materials related thereto) with affinity for the Antigen (which Antigen in the case of an existing license shall be listed on an Antigen List pursuant to Article II hereof). (c) Each Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4 hereof shall be subject to any existing grant of licenses, options, or rights of refusal or negotiation, in each case granted by Kirin prior to the Effective Date to Medarex or a Third Party of a license or other rights under the Kirin Technology, and Kirin's interests in the KM Patent Rights and/or KM Know-How to perform research and to determine whether such licensee desires to acquire a license under such technology with respect to Antibodies (and Antibody Materials related thereto) raised against and with affinity for Antigens and/or Antibody Products containing such Antibodies (and Antibody Materials related thereto). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -78-


 8.3.9 Retained Rights. (a) Notwithstanding anything in Section 8.3 of this Agreement to the contrary, in the case of each Medarex Antigen Semi-Exclusive Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4(c) hereof, Kirin hereby retains the right to grant licenses, options, or rights of refusal or negotiation under the Kirin Technology and Kirin's interests in the KM Patent Rights and KM Know-How to Kirin's Affiliates, Medarex, and Third Parties, to Exploit one or more Antibodies (and/or Antibody Products containing such Antibodies) raised against and with affinity for the Antigen that is the subject of such Antigen Semi-Exclusive Commercial License pursuant to any agreement entered into by Kirin prior to the date on which such Antigen Semi-Exclusive Commercial License is first exercised in accordance with the terms and conditions of Article IV hereof; provided, however, that Kirin does not retain the rights provided in this Section 8.3.9(a) with respect to any [*] for such License. (b) Notwithstanding anything in this Agreement to the contrary, in the case of each Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4 hereof, Kirin hereby retains the right to Exploit, and to grant licenses, options, or rights of refusal or negotiation under the Kirin Technology and its interest in the KM Patent Rights and KM Know-How to Kirin Affiliates, Medarex, and Third Parties, to Exploit, Antibodies with affinity for the Antigen that is the subject of the Commercial License, but raised against another Antigen. (c) Except as provided in Section 8.6.1(a) hereof, notwithstanding anything in this Agreement to the contrary, in the case of each Commercial License granted by Kirin to Medarex pursuant to Section 8.3.4 hereof, Kirin hereby retains the right under the Kirin Technology and Kirin's interests in the KM Patent Rights and KM Know-How, to immunize, and to grant to its Affiliates, Medarex, and Third Parties rights to immunize, any Collaboration Mice to raise Antibodies against Antigens for research purposes and to determine whether Kirin or such licensee or sublicensee, as the case may be, desires to retain or acquire a license or a sublicense with respect to any such Antibodies or Antigens. 8.4 Negotiations Regarding Licenses Outside the Field. Each Party acknowledges that the Licenses granted to the other Party in Sections 8.2 and 8.3 hereof are limited to the Field. The Parties acknowledge and agree that development and application of Collaboration Products outside the Field may be possible, and so long as the other Party is performing under and in compliance with this Agreement, and subject to Section 8.11 hereof, each Party agrees to negotiate in good faith with the other Party regarding reasonable terms and conditions, including, without limitation, payment-related terms, that might apply with respect to any future agreement entered into by the Parties for applications of Medarex Mice, Medarex Technology, Kirin Mice, Kirin Technology, KM-Mice, KM Know-How, KM Patent Rights, and/or Collaboration Products outside the Field. 8.5 Sublicenses. 8.5.1 Sublicense Rights Granted to Kirin. (a) Sublicense Rights Under Breeding License. Subject to Section 8.11 hereof, Kirin may grant sublicenses under the license granted to it in Section 8.2.1 hereof only to a Kirin Affiliate or Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project), in each case for the sole purpose of performing services related to the maintenance, propagation, and/or manipulation of Collaboration Mice and only with Medarex's prior written consent, not to be unreasonably withheld; provided, however, that no such sublicense shall include the right to grant a further sublicense. For purposes of this [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -79-


 Section 8.5.1(a), Medarex hereby consents to Kirin's use of CLEA Japan, Inc. as a contract service provider for services related to the maintenance, propagation, and/or manipulation of Collaboration Mice. (b) Sublicense Rights Under Evaluation License. Subject to Sections 8.6 and 8.11 hereof, Kirin may grant sublicenses under the Kirin Evaluation License granted to it in Section 8.2.2 hereof only to its Affiliates, Partners, In-House Collaborators, and Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project); provided, however, that no such sublicense shall include the right to grant a further sublicense under such Evaluation License, except that a sublicensee shall have a right to transfer Collaboration Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Kirin enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (c) Sublicense Rights Under Reservation License. Subject to Sections 8.6 and 8.11 hereof, Kirin may grant sublicenses under any Reservation License granted to it in Section 8.2.3 hereof only to its Affiliates, Partners, In-House Collaborators, or Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project); provided, however, that with respect to any immunizations to be performed by the sublicensee using Medarex Mice, Kirin may transfer Medarex Mice to such sublicensee only in accordance with the terms and conditions of Article IX hereof. Kirin shall have the right to grant to a sublicensee under such Reservation License the right to grant a further sublicense under such Reservation License, provided that, such further sublicense shall not permit the sublicensee to transfer to any Third Party any Collaboration Mice, or to grant to any Third Party a license or other right to use or immunize any Collaboration Mice, except that a sublicensee shall have a right to transfer Collaboration Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Kirin enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (d) Sublicense Rights Under Commercial License. (i) In General. Subject to Sections 8.5.1(d)(ii), 8.5.1 (e) and 8.11 hereof, Kirin may grant to its Affiliates, Partners, In-House Collaborators and Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project) sublicenses under any Commercial License granted to it in Sections 8.2.4(a), 8.2.4(b) or 8.2.4(c) hereof; provided, however, that Kirin shall not grant a sublicense to any such Person under any license (or sublicense) with respect to [*] and sublicensed to Kirin by Medarex as part of any such License, which in the case of such [*]; provided, further, that with respect to any immunizations to be performed by any of Kirin's sublicensees using Medarex Mice, Kirin may transfer Medarex Mice to such sublicensee only in accordance with the terms and conditions of Article IX hereof. Kirin shall have the right to grant to a sublicensee under such Commercial License the right to grant further sublicenses under such Commercial License, except that such rights shall expressly exclude the right to grant any sublicense under [*]. The terms of any such further sublicense shall not permit any such sublicensee to transfer to any Third Party any Collaboration Mice, or to grant to any Third Party a license or other right to use or immunize any Collaboration Mice, except that a sublicensee shall have a right to transfer Collaboration Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Kirin enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (ii) Sublicense of [*] Under [*] Agreement. Notwithstanding anything in this Agreement to the contrary, Medarex [*] licensed by Medarex to Kirin pursuant to [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -80-


 Section 8.2.4 herein shall include [*] any and all [*] to [*] the [*] (with the exception of [*] or [*]), including without limitation the [*] to [*], or if the [*] does [*] by [*] of the [*] to [*] a [*] to [*] with respect to [*] and [*] desires that such Person [*], Medarex [*] that [*] shall [*] a [*] with such Person [*] agreed to in writing by the Parties on the date of execution of this Agreement within [*] after the date on which [*] a [*]; provided, however, that Medarex shall not be required to [*] with respect to any given Antibody or Antibody Product [*]. If [*] business days after the date on which Medarex receives a written request from Kirin (which request was properly submitted by Kirin in accordance with the terms of this Section 8.5.1(d)(ii)), or if [*] desires to have [*] a [*] with such [*] (as documented by a [*] dated and signed by such [*], and [*] by [*], which [*] shall be maintained by [*]) but [*] is subject to [*] from [*] of [*] to enter into a [*], [*] to [*] a [*] with such Person (which form of agreement [*] agreed to in writing by the Parties on the date of execution of this Agreement, except that it shall be modified in each case to indicate the appropriate effective date and the counterparty's name, address, and other relevant identifying information, and to the extent that Annex A to the Direct Sublicense Agreement is modifiedYY in accordance with Section 8.5.1(d)(iii) hereof). In the event that any such Direct Sublicense Agreement [*], Kirin shall promptly [*]. In the event Medarex enters into [*] such Direct Sublicense Agreement pursuant to this Section 8.5.1(d)(ii) with a Person [*], the [*] granted by Medarex to Kirin hereunder shall be [*], provided, however, that such rights shall be [*] to [*] without [*] by the [*] in the event and to the extent that the [*]. (iii) [*]. The Parties acknowledge and agree that with respect to any [*] entered into by Medarex with any Person in accordance with Section [*], the [*] attached to, and made a part of, such [*] shall be used during the term of such [*] for the purposes of listing the (A) [*] with respect to which such Person shall have the license rights set forth in Section [*], (B) the [*], and (C) the [*] and type(s) of mouse (e.g., HuMAb Mouse(R), KM-Mousezz(TM), TC Mouse(TM) and/or HAC Mouse(TM)) with respect to which such Person shall have [*] set forth in Section [*]. It is understood and agreed by the Parties that prior to any [*] or type(s) of mouse) being added to [*], Kirin shall have exercised a Commercial License with respect to the Kirin Commercial Target against which such [*] are raised pursuant to Section 4.3 hereof and shall have [*] that corresponds to such Commercial License pursuant to Sections 4.4.1 and 4.4.2 hereof, subject to the availability of such Antibody(ies) and such Antigen(s) as determined in accordance with Article III hereof. From and after the date on which Kirin has [*] that corresponds to a Commercial License with respect to a particular Kirin Commercial Target pursuant to and in accordance with the terms and conditions of Article IV hereof, (1) Kirin may cause [*] to be amended to include such [*] (and reference to the Antigen against which such [*] was raised and the [*] and type(s) of mouse covered by the license) by [*], subject to the agreement of such Person to the terms of such amendment, in which case Medarex shall execute such an amendment within [*] business days after receiving Kirin's written request, or (2) such [*] pursuant to this Section 8.5.1(d)(iii) as of the date on which the terms and conditions of this Section 8.5.1(d)(iii) hereof are satisfied with respect to the [*], subject to [*] into such agreement confirming in writing their intent that [*]. In the case of any [*] made pursuant to clause (2) this Section 8.5.1(d)(iii), within [*] business days after the date on which [*] pursuant to this Section, Kirin shall deliver to Medarex the [*] (dated and signed by [*]), which shall be appended to the applicable [*] and made a part thereof. Notwithstanding the foregoing, Kirin acknowledges and agrees that Medarex shall [*] with respect to any given Antibody or Antibody Product [*], and Kirin represents, warrants and covenants to Medarex that Kirin shall not take any action to cause [*] to [*] in a manner that would [*]. Notwithstanding the foregoing, in the event that Kirin has not complied with any of the requirements of this Agreement with respect to the subject matter of any such amendment (including, without limitation, the listing of the [*] or type(s) of mouse with respect thereto), then such [*] shall have [*] or [*] and shall be [*] and the [*] shall be [*] with respect to the subject matter of the [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -81-


 (iv) Requests for [*] to Form of [*]. Medarex agrees that in the event any Person [*] desires to [*] the form of [*], upon [*] will [*] the form of [*], so long as [*]. Kirin agrees that in the event Medarex [*] the form of [*], upon Medarex's written request, Kirin will [*] the form of [*], so long as [*]. For the avoidance of doubt, neither Party shall have any legal obligation to negotiate with the other Party or any such Third Party, or to [*] the form of [*], provided that each Party shall perform its obligations under the first two (2) sentences, as applicable, of this Section. In the event that a Party agrees, in its sole discretion, to negotiate with the other Party with respect to any such [*] to the form of [*], the Party requesting the [*] to the form of [*], upon request by the other Party, shall [*]. Notwithstanding the foregoing, prior to Medarex's execution of any [*] form of [*], Medarex shall submit such form of [*] to [*] for [*], which [*]. (e) Sublicense Under [*]. Except with respect to a sublicense under any [*], for which further sublicensing by Kirin is governed by Section 8.5.1(d)(ii), the sublicenses granted by Medarex to Kirin pursuant to Section 8.2.5 hereof shall include the rights for Kirin to grant further sublicenses [*]; provided, however, that if any [*] does not permit Kirin to grant further sublicenses, upon receipt of written notice from Kirin requesting that Medarex grant a direct sublicense under such Medarex In-License Agreement to a Kirin Affiliate, Kirin Partner or In-House Collaborator, Medarex and Kirin shall [*] days after the date on which Kirin so notifies Medarex. From and after the date on which Medarex and Kirin [*], if Kirin provides additional written requests for Medarex [*], Medarex [*] within [*] business days after the receipt of any such request from Kirin. In the event that the Parties at any time during the Term negotiate and agree upon a form of [*] with respect to [*], once the Parties have reached agreement on the form of such [*], requests by Kirin or Medarex for amendments to such form shall be subject to [*] the form of [*]. (f) Sublicense Rights Under Trademark License. Subject to Section 8.11 hereof, Kirin may grant sublicenses under the Trademark license granted to it in Section 8.2.6(a) hereof only to its Affiliates, Partners, and In-House Collaborators, subject to Medarex's prior written consent and provided that such sublicenses are in accordance with the restrictions, limitations, and covenants set forth in Section 8.2.6(b) and 8.2.6(c) hereof. (g) Kirin's Obligations Under Licenses Continue. Each sublicense granted by Kirin to an Affiliate, Partner, In-House Collaborator, or Third Party contract service provider pursuant to Section 8.5.1(a), 8.5.1(b), 8.5.1(c), 8.5.1(d), 8.5.1(e), 8.5.1(f) or 8.5.3 hereof shall be consistent with all the terms and conditions of this Agreement, and subordinate thereto, and Kirin shall remain responsible to Medarex for the compliance of each sublicensee with the terms and conditions of this Agreement. 8.5.2 Sublicense Rights Granted to Medarex. (a) Sublicense Rights Under Breeding License. Subject to Section 8.11 hereof, Medarex may grant sublicenses under the license granted to it in Section 8.3.1 hereof only to Medarex Affiliates or Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project), in each case, for the sole purpose of performing services related to the maintenance, propagation, and/or manipulation of the Kirin Mice or KM-Mice and only with Kirin's prior written consent, not to be unreasonably withheld; provided, however, that no such sublicense shall include the right to grant a further sublicense. (b) Sublicense Rights Under Evaluation License. Subject to Section 8.11 hereof, Medarex may grant sublicenses under the Medarex Evaluation License granted to it in Section 8.3.2 hereof only to its Affiliates, Partners, In-House Collaborators, and Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -82-


 with a Services Project); provided, however, that no such sublicense shall include the right to grant a further sublicense under such Evaluation License, except that a sublicensee shall have a right to transfer Kirin Mice or KM-Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Medarex enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (c) Sublicense Rights Under Reservation License. Subject to Section 8.11 hereof, Medarex may grant sublicenses under any Reservation License granted to it in Section 8.3.3 hereof only to its Affiliates, Partners, In-House Collaborators and Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project); provided, however, that with respect to any immunizations to be performed by any sublicensee using Kirin Mice, Medarex may transfer Kirin Mice to such sublicensee only in accordance with the terms and conditions of Article IX hereof. Medarex shall have the right to grant to a sublicensee under such Reservation License the right to grant a further sublicense under such Reservation License, provided that, such further sublicense shall not permit the sublicensee to transfer to any Third Party any Kirin Mice or KM-Mice, or to grant to any Third Party a license or other right to use or immunize any Kirin Mice or KM-Mice, except that a sublicensee shall have a right to transfer Kirin Mice or KM-Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Medarex enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (d) Sublicense Rights Under Commercial License. Subject to Section 8.11 hereof, Medarex may grant sublicenses under any Commercial License granted to it in Sections 8.3.4(a), 8.3.4(b), or 8.3.4(c) hereof only to its Affiliates, Partners, In-House Collaborators, and Third Party contract service providers (which grant in the case of a Third Party contract service provider shall be in connection with a Services Project); provided, however, that with respect to any immunizations to be performed by any sublicensee using Kirin Mice, Medarex may transfer Kirin Mice to such sublicensee only in accordance with the term and conditions of Article IX hereof. Medarex shall have the right to grant to a sublicensee under such Commercial License the right to grant further sublicenses under such Commercial License. The terms of any such further sublicense shall not permit the sublicensee to transfer to any Third Party any Kirin Mice or KM-Mice, or to grant to any Third Party a license or other right to use or immunize any Kirin Mice or KM-Mice, except that a sublicensee shall have a right to transfer Kirin Mice or KM-Mice to one or more of its Third Party contract service providers if such Third Party contract service provider(s) and Medarex enter into an agreement(s) that governs the terms of such transfer to and use by such Third Party contract service provider(s). (e) Sublicense Rights Under Trademark License. Subject to Section 8.11 hereof, Medarex may grant sublicenses under the Trademark license granted to it in Section 8.3.7(a) hereof only to its Affiliates, Partners, and In-House Collaborators, subject to Kirin's prior written consent and provided that such sublicenses are in accordance with the restrictions, limitations, and covenants set forth in Section 8.3.7(b) and 8.3.7(c) hereof. (f) Medarex's Obligations Under Licenses Continue. Each sublicense granted by Medarex to an Affiliate, Partner, In-House Collaborator or Third Party contract service provider pursuant to Section 8.5.2(a), 8.5.2(b), 8.5.2(c), 8.5.2(d), 8.5.2(e) or 8.5.3 hereof shall be consistent with all the terms and conditions of this Agreement, and subordinate thereto, and Medarex shall remain responsible to Kirin for the compliance of each sublicensee with the terms and conditions of this Agreement. 8.5.3 Sublicenses to Affiliates to Enter into Agreements in Place of a Party. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -83-


 (a) Right to Sublicense to Affiliates. Subject to this Section 8.5.3, Section 8.11 and the other terms and conditions of this Agreement, in addition to the sublicense rights provided in Sections 8.5.1 and 8.5.2 hereof, as applicable, each Party hereto may grant sublicenses under the rights and licenses granted to it pursuant to Section 8.2 or Section 8.3, as applicable, to any of its Affiliates for the purposes of such Affiliate entering into Project Agreements governing In-House Projects and/or Partner Projects (and, in the case of Medarex, HuMAb License Projects, HuMAb Collaboration Projects and/or other projects relating to HuMAb Projects, to the extent that this Agreement contains terms and conditions applicable to such agreements) with other Affiliates or Third Parties in place of such Party. Notwithstanding the foregoing, Kirin's right to grant sublicenses to a Kirin Affiliate(s) under any Commercial License granted to Kirin by Medarex shall remain subject to Section 8.5.1(d)(i) and (ii) hereof, and if necessary in order for Kirin to provide rights under such Commercial License to a Kirin Affiliate, Medarex shall enter into a Direct Sublicense Agreement with such Affiliate pursuant to the terms and conditions of Section 8.5.1(d)(ii) hereof. In the event that a Party grants to an Affiliate (a) a sublicense under the Breeding License granted to such Party in Section 8.2.1 or 8.3.1 hereof, as applicable, and/or (b) in accordance with Article IX hereof, rights for such Person to transfer Kirin Mice or KM-Mice or Mice Materials derived therefrom (in the case of rights granted by Medarex to a Medarex Affiliate) or rights to transfer Medarex Mice or KM-Mice or Mice Materials derived therefrom (in the case of rights granted by Kirin to a Kirin Affiliate), and the Person subsequently becomes a Former Affiliate, such Party shall terminate such sublicense and such rights to transfer such mice and Mice Materials. (b) Form of Agreement with Affiliates. With respect to each agreement whereby a Party grants to an Affiliate a sublicense pursuant to Section 8.5.3(a) above, such agreement shall (i) be consistent with all the terms and conditions of this Agreement, and (ii) provide that such Affiliate shall be bound by the same terms and conditions applicable to such Party as set forth in this Agreement with respect to entering into and performing under Project Agreements governing In-House Projects and/or Partner Projects (and, in the case of Medarex, HuMAb License Projects, HuMAb Collaboration Projects and/or other projects relating to HuMAb Projects, to the extent that this Agreement contains terms and conditions applicable to such agreements) including, without limitation, the availability and selection of Antigens and Antibodies for the exercise of rights and licenses as determined in accordance with this Agreement. (c) Notices Relating to [*]. During the Term, in the event that Medarex [*], or (ii) secures by contract the right to designate [*], and in either case such information is publicly disclosed in a press release issued by Medarex, Medarex shall provide to Kirin a copy of such press release; provided, however, that Medarex's [*] to provide to Kirin a copy of such press release in accordance with this Section 8.5.3(c) shall [*] of Medarex's [*] under this Agreement. 8.6 Covenants Relating to Licenses and Sublicenses. 8.6.1 Covenants Relating to Evaluation Licenses and Sublicense(s) Under Evaluation Licenses. (a) Covenants Relating to Antigens Determined to be [*] (i) In the event that an Antigen is determined to be [*] to Medarex in accordance with the terms and conditions of Section [*] hereof, or is determined to be [*] to Kirin in accordance with the terms and conditions of Section [*] hereof, and such Antigen is the subject of a grant of a license or other rights by a Party to a Third Party pursuant to a written agreement entered into by the Party and the Third Party, the Party that made an availability inquiry with respect to such Antigen [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -84-


 pursuant to either of such Sections shall [*] to raise Antibodies against such Antigen, unless and until (x) such Antigen is [*] in accordance with the terms and conditions of Section [*] or [*] hereof; or (y) the Party that [*] or other [*] with respect to such Antigen [*] (and in the case where such Party is [*] that [*], is [*] by the [*] to [*], and in fact [*] in a [*] to the [*]) that the [*] of the [*] with respect to such Antigen is [*] the [*] or other [*]. (ii) Medarex and Kirin each further covenants to the other that it will include in its Project Agreements governing Partner Projects and/or In-House Projects entered into after the Effective Date terms and conditions that require such Party's Affiliates, Partners and In-House Collaborators, as applicable, either (x) [*] any Collaboration Mice to immunize against an Antigen [*] is [*] hereto that such Antigen is [*] (as determined in accordance with the terms and conditions of Section [*] or [*] hereof, as applicable) or (y) [*] any Collaboration Mice to immunize against an Antigen [*] is [*] hereto that such Antigen is [*] (as determined in accordance with the terms and conditions of Section [*] or [*] hereof, as applicable) [*]; provided, however, that with respect to clause (y) hereof, [*] each [*] that [*] a Party to a [*], as applicable, [*] (A) such Antigen is [*] in accordance with the terms and conditions of Section [*] or [*] hereof in response to [*]; or (B) the Party that has [*] such Antigen [*] (and in the case where such Party is [*], is [*] by the [*], and in fact [*] to the [*]) that either (1) such Party has [*] to a [*] or other [*] with respect to such Antigen pursuant to [*] or (2) if such Party has [*] to a [*] with respect to such Antigen pursuant to [*], the [*] with respect to such Antigen is [*] or other [*] to such [*]. (b) Covenants Relating to Sublicense Under Evaluation License. (i) Each Party covenants to the other Party that, subject to Section 8.6.1(b)(iv), with respect to each sublicense under its Evaluation License that is granted by such Party to a Third Party pursuant to an agreement originally entered into on or after the Effective Date, such Party shall [*] such Third Party to [*] terms and conditions [*] of this Section as follows: (1) such Party shall [*] terms and conditions [*] from [*], Collaboration Antibodies raised in the exercise of such sublicense, or Collaboration Products containing such Collaboration Antibodies, unless and until such [*] a [*] a [*] or a [*] (and/or in the case of a [*], a [*]) with respect to the Antigen against which such Collaboration Antibodies are raised; (2) in the event such Party is [*] in its [*] to [*] terms and conditions [*] clause (1), such Party shall [*] terms and conditions [*] to either [*] and any [*] or to [*] to the Party that grants such sublicense any and all [*] of such [*] any such [*], such Collaboration Antibodies, or Collaboration Products containing such Collaboration Antibodies, in the event that [*] does not [*] a [*] or a [*] (and/or, in the case of a [*], a [*] with respect to the Antigen against which such Collaboration Antibodies are raised within the [*] the terms of the sublicense agreement; and (3) in the event such Party is [*] in it [*] terms and conditions [*] either clause (1) or (2) above, such Party shall [*] terms and conditions [*] to [*] to such Party a [*], with the [*] to [*] Collaboration Antibodies (and Collaboration Products containing such Collaboration Antibodies) raised in the exercise of such [*] against and with affinity for an Antigen other than an Antigen with respect to which the [*] a [*] or a [*] (and/or, in the case of a [*], a [*]) within the [*] the terms of the sublicense agreement. (ii) In the event that a Party grants to a Third Party a sublicense under its Evaluation License pursuant to an agreement originally entered into on or after the Effective Date, and [*], such Party [*], Collaboration Antibodies raised in the exercise of such sublicense, and/or Collaboration Products containing such Collaboration Antibodies, and the sublicensee [*] (and/or, in the case of a sublicensee [*]) to [*] and/or [*] either such Collaboration Antibodies (and/or Collaboration Products containing such Collaboration Antibodies) or other Antibodies (whether or not Collaboration Antibodies) (and/or Antibody Products containing such Antibodies) raised against and with affinity for [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -85-


 the same Antigen within the [*] the terms of such sublicense agreement, such Party shall (and hereby does), [*] and subject to such other Party's acceptance of, and agreement to comply with, any terms that apply to the exercise of such rights by the first Party and its sublicensees (including any economic terms relating to the exercise of such sublicense), grant to such other Party a non-exclusive, perpetual, worldwide, sublicense under such license in the Field, with a right to grant further sublicenses (which sublicense shall be [*] in the event that such first Party obtains such license on a [*] basis); provided, however, that the grant of a sublicense by a Party to the other Party in this Section 8.6.1(b)(ii) shall be deemed [*] any Collaboration Antibodies (x) raised against and with affinity for an Antigen with respect to which the [*], (y) raised against and with affinity for an Antigen against which the [*], or (z) in the case of [*], raised against and with affinity for an Antigen [*] in connection with [*] (in each case as reflected on the appropriate Antigen List). (iii) It is understood and agreed that the intent of Sections 8.6.1(b)(i) and 8.6.1(b)(ii) hereof is to [*] a Party (and/or its sublicensees) with [*] to [*] certain Antibodies (and Antibody Products containing such Antibodies) raised against and with affinity for an Antigen in connection with the exercise of the licenses granted to such Party in Article VIII hereof and sublicenses granted by such Party hereunder (and, in the case of Medarex, through the exercise of Medarex's rights under the Medarex Technology) in the event that [*] with respect to Antibodies raised against such Antigen. Notwithstanding anything contained in this Section 8.6.1(b), it is understood and agreed that such Section shall [*], and that [*] this Section 8.6.1(b) is [*] that consist solely of the [*]. (iv) Notwithstanding anything contained in Section 8.6.1(b)(i) hereof, a Party may grant to a Third Party a sublicense under its Evaluation License in an agreement originally entered into on or after the Effective Date, [*], provided that the Party granting such sublicense (A) within [*] business days of the grant of such sublicense provides notice thereof to the other Party and (1) indicates in such notice that it is [*] upon the giving of such notice, or (2) pays to such other Party the amount of [*] in connection with such grant (which amount shall [*]; or (B) [*] the inclusion in the agreement with the Third Party of terms and conditions that [*] Each Party shall be permitted during the Term to exercise, in the aggregate, [*]. 8.6.2 Covenants Relating to Sublicense(s) Under Reservation License(s). (a) Each Party covenants to the other Party that with respect to each sublicense under any Reservation License that is granted by such Party to a Third Party pursuant to an agreement originally entered into on or after the Effective Date, such Party shall [*] include in such agreement a requirement that the sublicensee grant to such Party [*] license, with [*], in the [*] Collaboration Antibodies raised [*], in the event that the sublicensee does [*] (and/or, in the case of a sublicensee [*]) to [*] and/or [*] either such Collaboration Antibodies (and/or Collaboration Products containing such Collaboration Antibodies) or other Antibodies (whether or not Collaboration Antibodies) (and/or Antibody Products containing such Antibodies) raised against and with affinity for the same Antigen within the [*] the terms of such sublicense agreement. (b) In the event that a Party grants to a Third Party a sublicense under its Reservation License pursuant to an agreement originally entered into on or after the Effective Date, and [*], such Party obtains from such Third Party a license (with a right to sublicense) [*], and the sublicensee does [*] (and/or, in the case of a sublicensee [*]) to [*] and/or [*] either such Collaboration Antibodies (and/or Collaboration Products containing such Collaboration Antibodies) or other Antibodies (whether or not Collaboration Antibodies) (and/or Antibody Products containing such Antibodies) raised against and with affinity for the same Antigen within the [*] the terms of such sublicense agreement, such Party shall (and hereby does), [*] and [*], any terms that apply to the exercise of such rights by the first Party [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -86-


 and its sublicensees (including any economic terms relating to the exercise of such sublicense), grant to such other Party a [*]; provided, however, that the grant of a sublicense by a Party to the other Party in this Section 8.6.2(b) shall be deemed [*] Collaboration Antibodies (x) raised against and with affinity for an Antigen with respect to which the [*], (y) raised against and with affinity for an Antigen against which the [*], or (z) [*], raised against and with affinity for an Antigen [*]. (c) It is understood and agreed that the intent of Sections 8.6.2(a) and 8.6.2(b) hereof is to [*] a Party (and/or its sublicensees) with [*] to [*] and/or have [*] certain Antibodies (and Antibody Products containing such Antibodies) raised against and with affinity for an Antigen in connection with the exercise of the licenses granted to such Party in Article VIII hereof and sublicenses granted by such Party hereunder (and, in the case of Medarex, through the exercise of Medarex's rights under the Medarex Technology) in the event that [*] or other [*] with respect to Antibodies raised against such Antigen. Notwithstanding anything contained in this Section 8.6.2, it is understood and agreed that such Section shall [*], and that [*] this Section 8.6.2 is [*] that consist solely of the [*]. 8.6.3 Covenants Relating to Sublicense(s) Under Evaluation License, Reservation License and/or Commercial License. Each Party covenants that, with respect to any of the following sublicenses granted by such Party pursuant to an agreement entered into on or after the Effective Date under the Evaluation License granted to it pursuant to Section 8.2.2 or 8.3.2 hereof, a Reservation License granted to it pursuant to Section 8.2.3 or 8.3.3 hereof, as the case may be, or a Commercial License granted to it pursuant to Section 8.2.4 or 8.3.4 hereof, as the case may be: (a) Improvements to Collaboration Mice. The terms and conditions of such sublicense agreement that relate to the exercise of such sublicense shall (i) provide that any such sublicenses granted to the sublicensee do not permit the sublicensee to breed or otherwise attempt to improve the Collaboration Mice, and (ii) require the sublicensee to assign to the licensor Party any and all of the sublicensee's rights, title and interest in and to any Improvements to any Collaboration Mice that are conceived or developed by or on behalf of the sublicensee in connection with use of any Collaboration Mice and in violation of such sublicensee's rights under the sublicense; provided, however, that in the event that [*], the terms and conditions of such sublicense agreement shall [*]. For the avoidance of doubt, nothing contained in this Section shall prohibit Medarex from granting to an Affiliate or Third Party a right to breed or otherwise improve the Medarex Mice. (b) Destruction of Mice, Antibodies and Antibody Products. Such Party shall [*] in such sublicense agreement (a) a requirement that, within a reasonable time after the expiration of the applicable license period, such sublicensee shall destroy all Collaboration Mice immunized with an Antigen(s) pursuant to such license, all materials derived from such Collaboration Mice, and all Antibodies and Antibody Products obtained through use of such Collaboration Mice with respect to such Antigen(s), if as of the date of expiration or termination of the applicable license period no further license, sublicense, or other rights under the Medarex Technology, Kirin Technology, or KM Patent Rights have been granted to such sublicensee and remain in effect, and (b) a requirement that promptly after any such destruction an agent of such sublicensee shall provide such Party with written certification thereof. 8.6.4 Covenants Relating to Patent Rights, Know-How and Improvements Controlled by Affiliates. The Parties hereto acknowledge and agree that during the Term a Party may elect to grant sublicenses to Affiliate(s) (consistent with the terms and conditions of this Agreement, including Section 8.5.3 hereof) or otherwise provide to its Affiliate(s) access to its Technology, the KM Patent Rights, KM Know-How or one or more of the Collaboration Mice (in each case consistent with the terms and conditions of this Agreement, including Section 8.5.3 hereof). In the event that a Person which is an Affiliate of a Party within the meaning of Section 1.8 hereof (but for purposes of this Section 8.6.4, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -87-


 not a Person which is a Former Affiliate of a Party within the meaning of Section 1.72 hereof), in connection with the exercise of a license or sublicense in or to Technology or KM Patent Rights or KM Know-How, or otherwise as result of having access to any Collaboration Mice, (a) invents or otherwise Controls any Information and Inventions that would constitute Know-How of a Party if such Party invented or otherwise Controlled any such Information or Inventions, (b) invents or otherwise Controls any Improvements to any Collaboration Mice that would constitute Medarex Improvements or Kirin Improvements, if such Improvements were Controlled by Medarex or Kirin, as the case may be, or (c) Controls any Patent Rights that would constitute Medarex Patent Rights, Kirin Patent Rights or KM Patent Rights if such Patent Rights were Controlled by Medarex and/or Kirin, as the case may be, then in each case the Party for which such Person is an Affiliate shall obtain from such Affiliate rights with respect to such Know-How, Improvements and Patent Rights such that such Party Controls such Know-How, Improvements and Patent Rights for purposes of this Agreement. For the avoidance of doubt, the Party for which such Person is an Affiliate (y) shall obtain such rights from such Person with respect to any such Know-How, Improvements or Patent Rights invented or originally Controlled by such Person during the Period when such Person satisfies the definition of an "Affiliate" contained in Section 1.8 hereof (but not the definition of a "Former Affiliate" contained in Section 1.72 hereof), which rights once obtained from such Person shall continue to exist in favor of such Party even in the event that such Person later becomes a Former Affiliate, and (z) shall have no obligation to obtain such rights from such Person with respect to any such Know-How, Improvements or Patent Rights invented or otherwise originally Controlled by such Person during the period when such Person satisfies the definition of a "Former Affiliate". Notwithstanding the foregoing, nothing in this Section 8.6.4 shall affect any obligation of a Party arising under Section 8.6.3 hereof, with respect to certain sublicense agreements entered into by such Party, including sublicense agreements entered into by such Party and an Affiliate or Former Affiliate. 8.6.5 Covenant Relating to Refusal Rights. Each Party represents, warrants and covenants to the other Party that from and after the Effective Date, it shall not enter into a Project Agreement with an Affiliate or Third Party in which such Party grants to the Affiliate or Third Party Refusal Rights; provided, however, that nothing contained in this Section 8.6.5 shall [*] granting to an Affiliate or Third Party [*] to [*] or, in the case of [*], in each case, with respect to one or more Antibodies raised against and with affinity for an Antigen. 8.7 Termination of Commercial License. 8.7.1 Termination. Either Party may terminate any Commercial License granted to it hereunder by the other Party on a country-by-country basis, with respect to any Commercial Target, at any time with immediate effect by giving written notice to the other Party, or if the giving of such notice shall not be permitted under applicable law, either by any clear and unequivocal manifestation of such intention that is permitted by applicable law or by unilateral surrender or nonuse of the applicable rights in any commercially reasonable manner under the circumstances (such Party terminating or attempting to terminate as provided herein, is herein called the "Terminating Party" and the other Party is sometimes referred to as the "Non-Terminating Party"). Following such complete or partial termination of the particular license, the terminating Party shall have no further right, title, or license under the other Party's Technology or the other Party's interest in the KM Patent Rights or KM Know-How, to the extent of the termination of such License. 8.7.2 Covenants. Upon termination (or attempted termination) of any Commercial License granted hereunder, in whole or in part, pursuant to Section 8.7.1 hereof or by rejection pursuant to the Bankruptcy Code or by rescission pursuant to the Japanese bankruptcy law, in the event that the Terminating Party (or any of its sublicensees) has filed any patent applications containing a novel [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -88-


 disclosure of, or claiming, Information or Inventions containing the other Party's Technology or KM Patent Rights or KM Know-How and relating to or covering Collaboration Antibodies or Collaboration Products that are within the scope of the terminated portion of the license, the Parties intend for the licensor Party to have freedom to operate with respect to such Information and Inventions, so long as the licensor Party is in compliance with its obligations under this Agreement to the licensee Party. The Terminating Party hereby grants, and in the case of any such patent application filed by the Terminating Party's sublicensee (in connection with an agreement entered into by the Terminating Party and the sublicensee after the Effective Date), [*] a non-exclusive, sublicensable, transferable license in the Field under such Patent Rights, [*] (and with respect to any such license granted to the Terminating Party by a sublicensee, the Terminating Party hereby grants to the Non-Terminating Party a non-exclusive sublicense under the license granted to the Terminating Party by its sublicensee, subject to the Non-Terminating Party's acceptance of and agreement with any terms and conditions that apply to the exercise of such rights by the Terminating Party or its sublicensees [*])); provided, however, that the Terminating Party hereby grants such license pursuant to this Section 8.7.2 and only with respect to claims relating to or covering subject matter containing the Non-Terminating Party's Technology and the Non-Terminating Party's interest in KM Patent Rights and relating to or covering Collaboration Antibodies or Collaboration Products that are within the scope of the terminated portion of the license (and only to the extent not prohibited by the terms of any Third Party agreement pursuant to which such Party Controls any such Patent Rights). Notwithstanding the foregoing, it is understood and agreed that nothing contained in this Section 8.7.2 is intended to require a Party or its sublicensee to grant any license under Patent Rights in any Information and Inventions that consist solely of the composition of an Antigen or a Production Process Development. 8.8 License Grants and Exercise [*]. 8.8.1 Special Licenses. The Parties acknowledge and agree that, [*], Medarex granted to Special Licensees certain rights, including a license(s), in or to certain technology owned or in-licensed by Medarex, and that not all the terms and conditions relating to such Special Licensees' Exploitation of such technology mirror the terms and conditions hereunder relating to Exploitation of licensed technology by Medarex's sublicensees. Medarex acknowledges and agrees that it has reviewed Special License No. 1 and Special License No. 2, and Kirin acknowledges and agrees that it has reviewed redacted versions of such agreements, and based on their respective reviews of those agreements, each Party hereby agrees that any and all material conflicts between Special License No. 1, on the one hand, and this Agreement, on the other hand, and between Special License No. 2, on the one hand, and this Agreement, on the other hand, are described in a writing prepared jointly by the Parties with respect to this Section 8.8.1 and exchanged by the Parties on the date of execution of this Agreement. With respect to any material conflicts noted on the writing exchanged by the Parties pursuant to this Section 8.8.1, and with respect to any other conflicts that may be determined in the future to exist between either Special License No. 1 or Special License No. 2 and this Agreement, the terms of the Special License No. 1 and/or Special License No. 2, as the case may be, shall control. In addition, Medarex acknowledges and agrees that it has reviewed Special License No. 3 and Special License No. 4 (which agreements have been reviewed by Kirin only in their redacted forms as available to the public from the SEC's database), and based on Medarex's review of those agreements, Medarex hereby agrees that there are no material conflicts between Special License No. 3, on the one hand, and this Agreement, on the other hand, and between Special License No. 4, on the one hand, and this Agreement, on the other hand, that are materially different than any conflicts contained in Special License No. 1 and/or Special License No. 2 (whether or not listed on the writing exchanged by the Parties pursuant to this Section 8.8.1). With respect to any material or other conflicts that may be determined in the future to exist between Special License No. 3, on the one hand, and this Agreement, on the other hand, and/or between Special License No. 4, on the one hand, and this Agreement, on the other hand, which conflicts are not materially different than any [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -89-


 conflicts that exist between Special License No. 1 and/or Special License No. 2, on the one hand, and this Agreement, on the other hand, the terms of Special License No. 3 and Special License No. 4 shall control. With respect to any material conflicts that may be determined in the future to exist between either Special License No. 3, on the one hand, and this Agreement, on the other hand, and/or between Special License No. 4, on the one hand, and this Agreement, on the other hand, which [*] that exist between Special License No. 1 and/or Special License No. 2, on the one hand, and this Agreement, on the other hand, [*]. 8.8.2 License Grants in Connection with Partner Projects. The Parties acknowledge and agree that, [*] Kirin has, under a single Project Agreement governing a Kirin Partner Project, granted to Corixa Corporation licenses under the Kirin Technology and/or sublicenses under the Medarex Technology, KM Patent Rights, or KM Know-How to immunize Collaboration Mice and/or to Exploit and/or have Exploited Collaboration Antibodies (or Collaboration Products containing such Collaboration Antibodies) against one or more Antigens. The Parties acknowledge and agree that, [*], Medarex [*] to one or more Partners sublicenses or options, or rights of refusal or negotiation under the Kirin Technology, KM Patent Rights, or KM Know-How to Exploit and/or have Exploited Collaboration Antibodies (and/or Collaboration Products containing such Collaboration Antibodies) against one or more Antigens; provided, however, that such acknowledgment and agreement by the Parties shall in no way [*] of any rights afforded to a Party hereto or of any covenants made by either Party or a release of obligations imposed on either Party under this Agreement with respect to grants by a Party to Partners [*]. Subject to the availability of such Collaboration Antibodies and Antigens for licensing, any such license or other rights granted by Kirin or Medarex shall be effective as of the date of such grant of rights and shall remain in full force and effect as if such grants were made pursuant to this Agreement. (For the avoidance of doubt, the payment obligations of the Parties hereunder shall apply with respect to such agreements). From and after the Effective Date, each Party shall grant sublicenses to its Partners under the other Party's Technology and the other Party's rights and interest in and to the KM Patent Rights and KM Know-How only in accordance with the terms and conditions of this Agreement. 8.8.3 Exercise of Rights Pursuant to [*] for Collaboration in Connection with In-House Projects. The Parties acknowledge and agree that, [*], Kirin has exercised certain rights under the license granted to Kirin by Medarex in connection with a Kirin In-House Project, and Medarex has exercised certain rights granted to Medarex by Kirin in connection with Medarex In-House Projects, and that any such rights shall be deemed to have been granted by the licensor Party and exercised by the licensee Party on a non-exclusive basis under an Evaluation License; provided, however, that with respect to each Target designated by Kirin as an In-House Target [*], such Target shall be deemed to be a Reservation Target and a ROFR Target and Kirin shall be deemed to have exercised a Kirin Reservation License with respect to such Target, in each case as of the Designation Date for such Reservation Target, and to have renewed such Reservation License every [*] months during the period from the [*] such that as of [*] Kirin shall continue to have a Reservation License with respect to such Target, which Reservation License shall expire on the date that is [*] months after the [*] renewal date unless otherwise renewed by Kirin in accordance with the terms and conditions of Section 4.2.4 hereof (such period for each such Reservation License shall be deemed to be the "Reservation License Period"). From and after the Effective Date, each Party shall continue to exercise rights in and to the other Party's Technology and the other Party's rights and interest in the KM Patent Rights and KM Know-How in connection with In-House Projects only in accordance with the terms and conditions of this Agreement. 8.9 Condition Precedent to Grant of a Commercial License. Notwithstanding anything contained in this Agreement, any grant by Medarex to Kirin or by Kirin to Medarex of a Commercial License, and any exclusive license granted by Kirin to Medarex pursuant to Section 8.3.6 hereof, shall be conditioned on the termination or expiration of the applicable waiting period with respect to such License, if any, under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, 15 U.S.C. (S) 18a. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -90-


 8.10 Registration of Patent Licenses. Kirin acknowledges and agrees that, subject to Section 8.11 hereof, Medarex may register with the Japanese Patent Office, to the full extent permitted by Japanese law, each of the license grants made to Medarex by Kirin in this Agreement. Kirin warrants and covenants to Medarex that, subject to Section 8.11 hereof, Kirin shall cooperate fully with Medarex to register such license grants with the Japanese Patent Office, including by executing and consenting to the filing of such documents as are reasonably required to accomplish such registration(s). 8.11 [*] Obligations and Rights Preserving Excuse. 8.11.1 Acknowledgement of Intention of Parties. The Parties hereto acknowledge and agree that each Party owes the other performance of a variety of obligations under this Agreement and that the performance of those obligations is given in consideration of reciprocal obligations owed by the other Party. The Parties therefore agree that it is their intention that should a Party (the "Obligor Party") [*] to the other Party (the "Receiving Party") to such an extent that the Receiving Party is [*] under this Agreement, then the Obligor Party should not be entitled to [*] during the period of the Obligor Party's [*] owed by the Receiving Party to the Obligor Party. The intention is that [*] Obligor Party should be entitled to [*] of this Agreement from the Receiving Party without [*] owed to the Receiving Party because a substantial part of the consideration each Party is receiving in exchange for what it is providing, is the [*] by the other Party. Therefore, the Parties agree that in the event an Obligor Party [*] under this Agreement to such an extent that the Receiving Party is [*] under this Agreement, then regardless of whether the Obligor Party has a [*], including any [*] on the use by the Receiving Party of [*] from the Obligor Party, such circumstance shall give rise to a condition referred to in this Agreement as "Rights Preserving Excuse" in favor of the Receiving Party. If a Receiving Party has "Rights Preserving Excuse" it shall mean that the Receiving Party is [*] to the Obligor Party under this Agreement, including with respect to this Article VIII, in the event that a Cure is not effectuated by the Obligor Party within the Cure Period, all within the meaning of this Section 8.11. One example of a circumstance that would give rise to Rights Preserving Excuse, but not the sole example, is where the Obligor Party has become [*] under this Agreement such that the Receiving Party is [*] under this Agreement, and should itself therefore be [*] under the terms of this Agreement from [*] to the Obligor Party. Further, to the extent permitted by applicable law, the Parties intend for the Receiving Party to receive the same benefits under this Section 8.11 whether the Obligor Party is seeking protection under the [*] laws of the United States or the [*]. 8.11.2 Mechanics of Assertion of Rights Preserving Excuse. In the event that circumstances have arisen to cause the Receiving Party to reasonably conclude that it has Rights Preserving Excuse, then: (a) if there is [*] on the part of the Receiving Party to [*] from the Obligor Party and/or to notify the Obligor Party that the Receiving Party believes it has Rights Preserving Excuse, then the Receiving Party shall send the Obligor Party written notice that Rights Preserving Excuse has arisen, providing a reasonable description of the basis for the assertion of Rights Preserving Excuse, and the Obligor Party shall have [*] calendar days within which either to advise the Receiving Party the means by which a Cure shall be effected by the Obligor Party within the Cure Period (as defined below), or advise the Receiving Party that the Obligor Party believes no Rights Preserving Excuse has arisen and why; or (b) if there is [*] on the part of the Receiving Party to [*] from the Obligor Party and/or to notify the Obligor Party that the Receiving Party believes it has Rights Preserving Excuse, including by [*], then the Receiving Party shall file a pleading, paper or other notice with the applicable court [*] or, in the case of a [*], stating that Rights Preserving Excuse has arisen and seeking to compel any performance that the Receiving Party believes has [*], and providing a reasonable description of the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -91-


 basis for the assertion of Rights Preserving Excuse. The filing of the pleading, paper or other notice with the court [*] as described herein shall constitute notice to the Obligor Party of the Receiving Party's claim that Rights Preserving Excuse has arisen, regardless of how or whether any motion, proceeding or matter is resolved pursuant to the pleading, paper or other notice that was filed with the applicable court [*]. 8.11.3 [*] If, after the Receiving Party gives notice of a Rights Preserving Excuse pursuant to Section 8.11.2(a) or 8.11.2(b) hereof (a "Notice of Rights Preserving Excuse"), (i) the Obligor Party proposes a Cure to the Receiving Party in writing and does not receive, within [*] calendar days thereafter, written confirmation from the Receiving Party that the proposed Cure is acceptable to the Receiving Party, or (ii) the Obligor Party disputes whether Rights Preserving Excuse has arisen in favor of the Receiving Party, then the Obligor Party may seek to have issues of whether the Obligor Party has proposed an adequate Cure and/or whether a Rights Preserving Excuse exists resolved by [*]. If the Obligor Party desires to have any such issue so resolved, the Obligor Party shall so notify the Receiving Party with a written [*]." Upon receipt by the Receiving Party of the [*], the Parties shall endeavor to agree on the choice of a cost-effective [*] unless otherwise agreed by the Parties) before [*] within [*] business days after the selection of [*]. If the Parties cannot agree upon [*] within [*] calendar days after the Receiving Party receives the [*], then the Parties shall retain [*] or its successor, or only if [*] is not available, some other similar [*], to select the [*] and the Parties shall participate in a [*] business days in length unless otherwise agreed by the Parties) before such [*] within [*] business days after the selection of such [*]. The Parties agree to participate in such [*]. The costs of such [*] service shall be borne [*]. No judge [*] of a court with jurisdiction over either Party, or over any such dispute, shall be eligible to serve as a [*]. Any such [*] shall be conducted in the County of San Diego unless otherwise agreed by the Parties. All offers, promises, conduct and statements, whether oral or written, made in the course of the [*] by any of the Parties, their agents, employees, experts and attorneys, and by the [*], are confidential, privileged and inadmissible for any purpose, including impeachment, in any litigation or other proceeding involving the Parties, provided that evidence that is otherwise admissible or discoverable shall not be rendered inadmissible or non-discoverable as a result of its use in the [*]. Except as expressly set forth in this Section 8.11, no conduct of a Party with respect to any such [*] shall affect any Rights Preserving Excuse or any other right or obligation of a Party. In particular, no Party's [*] in any [*] shall constitute a breach of any duty or obligation under this Agreement, or shall create any right, claim or defense by the other Party. 8.11.4 Cure; Cure Period and Status of Rights Preserving Excuse During Mediation. In the event that a Rights Preserving Excuse exists in favor of the Receiving Party and the Receiving Party gives Notice of Rights Preserving Excuse, then the Obligor Party shall have the Cure Period within which to effectuate a "Cure" within the meaning of this Section 8.11.4. Until the Cure Period lapses without the Obligor Party effecting a Cure, or if a court determines that no Rights Preserving Excuse exists in favor of the Receiving Party, the Receiving Party must render performance hereunder. "Cure" for purposes of this Section 8.11 shall mean (a) cure of the breaches set forth in the Notice of Rights Preserving Excuse by performance by the Obligor Party, to the extent that the Receiving Party is once again [*] under this Agreement, (b) performance by the Obligor Party of remedies for such breaches, which remedies would be deemed adequate under applicable [*] law (including, for example, payment of monetary damages in certain circumstances), to the extent that the Receiving Party is once again [*] under this Agreement, or (c) only in the case of a [*] on the part of the Receiving Party to compel performance of this Agreement by the Obligor Party, [*] of this Agreement in accordance with applicable [*]. In the event a Cure is effected by [*] of this Agreement by the Obligor Party [*], the Receiving Party shall no longer have Rights Preserving Excuse, but instead will have the rights and remedies accorded to the Receiving Party under [*] and shall have the ability as set forth therein (among other things) either to continue to retain certain of its rights under this Agreement (without creating a Rights Preserving Excuse in favor of the rejecting Obligor Party), or to treat this Agreement as [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -92-


 terminated. In the event that the Obligor Party fails to effect a Cure within the Cure Period, regardless of whether the Obligor Party resorts to [*] pursuant to Section 8.11.6 hereof, the Receiving Party shall have the benefit of Rights Preserving Excuse and [*] in favor of the Obligor Party, and such [*] until such time as a Cure is effected or a court determines pursuant to Section 8.11.6 hereof that no Rights Preserving Excuse exists in favor of the Receiving Party, whereupon the Receiving Party shall be required to promptly [*] to the existence (or assertion) of the Rights Preserving Excuse. 8.11.5 Effect of Failure to Cure. After the end of the Cure Period, in the absence of Cure, then and only then shall the Receiving Party be [*] (until Cure is effected or this Agreement is duly terminated in accordance with Article XIV) from [*] to the Obligor Party (because the Receiving Party failed to [*]) and the Receiving Party shall retain all of its rights and remedies against the Obligor Party on account of the failures to perform this Agreement that gave rise to the Rights Preserving Excuse, and on account of any other breaches under applicable law, including, if the Receiving Party so elects, to seek to terminate this Agreement in accordance with Article XIV. In the event that the Receiving Party shall [*] under the Agreement by reason of a Rights Preserving Excuse, then until such time as this Agreement is terminated in accordance with Article XIV, the Obligor Party may obligate the Receiving Party to [*] owed to the Receiving Party. In the event that (a) the Receiving Party shall [*] under this Agreement by reason of asserting that Rights Preserving Excuse exists in its favor, and (b) the Obligor Party [*] that the Receiving Party has Rights Preserving Excuse and commences [*] pursuant to Section 8.11.6 hereof to resolve such dispute, the Obligor Party may [*] to the Receiving Party as the Obligor Party contends it is [*] (and which form the basis of Obligor Party's contention that Receiving Party has not failed to [*] because Obligor Party is still [*] to prevent Rights Preserving Excuse from arising). Moreover, the Obligor Party may withhold such performance until the earliest to occur of the following: (i) a determination by [*] that Rights Preserving Excuse in fact existed in favor of the Receiving Party, where the Obligor Party [*] as contemplated by Section 8.11.6 hereof; (ii) a determination by a [*] that Rights Preserving Excuse in fact existed in favor of the Receiving Party; (iii) a determination by the [*] that Rights Preserving Excuse did not exist in favor of the Receiving Party, where the Receiving Party [*] as contemplated by Section 8.11.6 hereof, provided that the Receiving Party [*] on the grounds of Rights Preserving Excuse; and/or (iv) a determination by a [*] that Rights Preserving Excuse did not exist in favor of the Receiving Party, provided that the Receiving Party [*] on the grounds of Rights Preserving Excuse. The Receiving Party's election [*] hereunder so long as Rights Preserving Excuse exists, shall not in and of itself [*] the Obligor Party from [*] of its affirmative obligations under the Agreement, nor shall it give the Obligor Party grounds to terminate this Agreement under Article XIV. 8.11.6 Legal Proceedings. If the Parties for whatever reason shall fail to reach agreement on the issues of whether a Rights Preserving Excuse exists and/or whether the Obligor Party has effected a Cure prior to any termination of this Agreement pursuant to Article XIV, then either Party may initiate a legal proceeding to resolve such dispute(s). The Parties hereby [*] consent to the [*] jurisdiction of the courts of [*] for any action, suit or proceeding arising out of or relating to any such dispute, and agree not to commence any action, suit or proceeding related thereto except in such courts. The Parties further hereby [*] consent to, and [*] to, the laying of venue of any action, suit or proceeding (other than appeals therefrom) arising out of or relating to this Agreement in [*], and hereby further [*] waive and agree not to plead or claim in any such court that any such action, suit or proceeding brought in any such court has been brought [*]. Any Party that fails to [*] hereunder such that a Rights Preserving Excuse arises in favor of the other Party shall be liable for [*] to such other Party as well as being subject to [*], and any Party that fails to [*] hereunder on the ground that a Rights Preserving Excuse exists in its favor shall be liable for [*] to the other Party in the event that a court determines that there was no such Rights Preserving Excuse as well as being subject to [*]. The Parties also agree to [*] their respective rights to a [*] of any claim or cause of action based upon or arising out of any of this Agreement or any of the transactions contemplated herein, including contract claims, tort claims, breach of duty claims, and all [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -93-


 other common law or statutory claims. The Parties represent that each has reviewed [*] following consultation with legal counsel. In the event of litigation, a copy of this agreement may be filed as a written consent to a trial [*]. 8.12 No Other Rights. For the avoidance of doubt, Medarex shall have no right, express or implied, with respect to the Kirin Technology, Kirin Trademarks, or any of Kirin's right, title and interest in the KM Patent Rights, KM Know-How, or KM Trademarks, and Kirin shall have no right, express or implied, with respect to the Medarex Technology, Medarex Trademarks, or any of Medarex's right, title and interest in the KM Patent Rights, KM Know-How, or KM Trademarks, in each case except as expressly provided in this Agreement. ARTICLE IX TRANSFER OF MATERIALS 9.1 Transfer of Mice and Mice Materials. 9.1.1 Transfer of Materials Between the Parties. (a) Transfer of Medarex Materials and Kirin Materials Between the Parties. From time to time upon written reasonable request by Kirin, Medarex shall provide Medarex Materials to Kirin (or its Affiliates) for use by Kirin or Kirin Affiliates in connection with the research, development, and commercialization of Collaboration Products, in such quantities as are reasonably available. From time to time upon written reasonable request by Medarex, Kirin shall provide Kirin Materials to Medarex (or its Affiliates) for use by Medarex and Medarex Affiliates in connection with the research, development, and commercialization of Collaboration Products, in such quantities as are reasonably available. Subject to Section 9.1.2 hereof, each Party also agrees to provide Materials in such quantities as are reasonably available and as the other Party may from time to time reasonably request [*] in connection with the research, development, and commercialization of Collaboration Products. (b) Further Agreement Governing Transfer of Materials. Promptly following the Effective Date, the Parties shall cooperate in good faith to agree on a process for the transfer of Materials from one Party to the other Party pursuant to Section 9.1.1(a) and to agree upon any additional terms that shall apply to such transfer(s), and shall to the extent determined to be reasonably necessary by the Parties, negotiate in good faith to enter into a separate written agreement governing such transfer(s), the terms of which shall include, without limitation, [*] for the provision of services relating to the transfer of Materials. (c) No Sale, Lease or Transfer of Title. Notwithstanding anything contained in this Agreement, no transfer by a Party to the other Party of any Collaboration Mice or any Mice Materials relating thereto, whether pursuant to this or any other agreement between the Parties that may be entered into pursuant to Section 9.1.1(b) hereof, or that may have been entered into prior to the Effective Date, shall constitute a sale, offer for sale, lease, offer for lease or other transfer of title to any such Collaboration Mice or Mice Materials derived therefrom. 9.1.2 Transfer of Collaboration Mice and Mice Materials to Third Parties and Control Requirements Relating Thereto. (a) Transfer of Collaboration Mice and Mice Materials. The Parties agree that from and after the Effective Date each Party and its Affiliates shall be permitted, in connection with [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -94-


 the exercise of licenses granted to such Party in Article VIII hereof, and subject to the terms and conditions of this Agreement, to transfer Collaboration Mice and/or Mice Materials derived therefrom to such Party's Affiliates and Third Parties that have been granted rights to use such Collaboration Mice in accordance with Article VIII hereof, for use by such Affiliates and Third Parties in the research, development, and/or commercialization of Collaboration Products; provided, however, that prior to making any such transfer of Collaboration Mice or Mice Materials derived therefrom to an Affiliate or a Third Party, such Party shall have entered into a written agreement with such Affiliate or Third Party that governs the terms of such transfer, which terms shall be consistent with the terms and conditions of this Agreement, and, in the case of a Third Party, shall prohibit such Third Party from further transferring such mice except to the extent expressly permitted in Section 8.5.1 and 8.5.2 hereof, as applicable; provided, further, that Kirin shall not transfer, directly or indirectly, any Medarex Mice to any Affiliate or Third Party, and Medarex shall not transfer, directly or indirectly, any Kirin Mice to any Affiliate or Third Party, without the prior written consent of the other Party. For the avoidance of doubt, Medarex (and its Affiliates) may provide Medarex Mice and/or KM-Mice directly to Medarex Affiliates and Third Parties, and Kirin (and its Affiliates) may provide Kirin Mice and KM-Mice directly to Kirin Affiliates and Third Parties in connection with the research, development, and commercialization of Collaboration Products, on terms and conditions consistent with this Agreement. Notwithstanding anything contained in this Agreement, neither Party shall be permitted, in the exercise of its rights hereunder, to sell, offer to sell, lease, offer to lease or otherwise transfer title to any Collaboration Mice or Mice Materials derived therefrom. For the avoidance of doubt, nothing contained in this Section 9.1.2(a) shall apply to, or otherwise restrict, transfers of Medarex Mice by Medarex to an Affiliate or Third Party. (b) Control Requirements. Each Party hereby acknowledges the value of the Collaboration Mice and Mice Materials derived therefrom, as well as the possibility that, absent implementation and compliance with reasonable security precautions, the Collaboration Mice and Mice Materials derived therefrom may be transferred to or acquired by, legally or otherwise, Third Parties not in privity with either Party, their respective Affiliates, or sublicensees. Accordingly, each Party agrees, and shall cause its Affiliates and sublicensees with which it enters into agreements after the Effective Date to agree, to implement and maintain such procedures as it, in its reasonable discretion, believes to be necessary or useful to prevent unauthorized access to or transfer of Collaboration Mice and/or Mice Materials derived therefrom to unauthorized Third Parties. Upon written request, from time to time during the Term hereof but in no event more often than once every two (2) years, each Party agrees to provide the other Party with a detailed written summary of the procedures it implements and maintains in this regard. 9.1.3 Transfer and Use of Collaboration Antibodies and Antibody Materials to Third Parties. The Parties agree that each Party and its respective Affiliates shall be permitted, subject to the terms and conditions of this Agreement, to transfer Collaboration Antibodies (and Antibody Materials related thereto) to Affiliates and Third Parties for research, analysis, characterization, evaluation, clinical trials and commercialization, with regard to such transferred Collaboration Antibodies (and Antibody Materials related thereto), and that, subject to the terms and conditions of this Agreement, the transferring Party may permit such Affiliates and Third Parties to further transfer such Collaboration Antibodies (and Antibody Materials related thereto) to other Affiliates or Third Parties (a) to perform evaluation, clinical trials, research, and development activities with respect to such Collaboration Antibodies, and (b) subject to Section 8.5.1(d) hereof, to commercialize such Collaboration Antibodies and Antibody Products containing such Collaboration Antibodies (and Antibody Materials relating thereto). 9.2 Information Disclosure. Except to the extent prohibited by the terms of an agreement with a Third Party or covered by the attorney-client privilege, in response to a reasonable request by the other [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -95-


 Party, each Party shall, without additional compensation, disclose and make available to such other Party, information, data, and documentation that is created or otherwise obtained during the Term of this Agreement, which relates to the non-requesting Party's Patent Rights and Know-How, or KM Patent Rights and KM Know-How, and is conceived, reduced to practice, or otherwise developed solely by its (or any of its Affiliates') employees and/or agents, or jointly by one or more of its (or any of its Affiliates') employees and/or agents and one or more employees and/or agents of the other Party (or its Affiliates), solely for the receiving Party's use within the scope of this Agreement, but excluding Information and Inventions (a) that would fall within the definition of "Excluded Claims" or "Excluded Know-How"; or (b) relating to such Party's (or any of its Affiliates', licensees' or sublicensees') Production Process Technology. 9.3 Production Process Technology. Notwithstanding anything to the contrary in this Article IX or elsewhere in this Agreement, neither Party shall be obligated to disclose or provide any of its Production Process Technology to the other Party or any of its sublicensees except as may be required or permitted under a separate written agreement, if any, entered into by the Parties. ARTICLE X LICENSE FEES, MILESTONES, ROYALTIES AND OTHER PAYMENTS 10.1 Initial License Fees and Other Consideration. 10.1.1 Initial License Fee. Medarex hereby acknowledges that Kirin has paid to Medarex a non-refundable, non-creditable Initial Fee. 10.1.2 Other License Consideration. Subject to the terms and conditions set forth in this Agreement, until the earlier to occur of (a) [*] and (b) the date of the payment of monies by Kirin to Medarex that causes the total amount paid by Kirin to Medarex pursuant to this Article X (including the Initial Fee as set forth in Section 10.1.1 hereof and payments made by Kirin to Medarex pursuant to this Section 10.1.2) to equal or exceed [*] Kirin shall (i) pay to Medarex the amount that equals [*] of the sum of (A) the balance of the aggregate Partner Royalties paid to Kirin by its Partners with respect to Kirin Partner Projects, after deduction of amounts paid to Medarex pursuant to Section 10.7.1 hereof, and (B) the balance of the aggregate Partner Payments paid to Kirin by its Partners with respect to Kirin Partner Projects, after deduction of the amounts paid to Medarex pursuant to Section 10.7.3 hereof, and (C) the balance of the aggregate payments paid to Kirin by Kirin Partners with respect to Kirin Partner Projects as reservation license fees, commercial license fees, Antigen exclusivity fees, or the equivalent of any of the foregoing, after deduction of the amounts paid to Medarex pursuant to Sections 10.2.2, 10.3.1(b) and 10.4.2 hereof, as applicable; and (ii) pay to Medarex the amount that equals [*] of the sum of (A) the amounts actually paid to Kirin by Medarex pursuant to Section 10.7.2 hereof, (B) the amounts actually paid to Kirin by Medarex pursuant to Section 10.7.4 hereof, including, without limitation, any Partner Payments received by Medarex from Special Licensees, (C) the amounts actually paid to Kirin by Medarex pursuant to Sections 10.2.2, 10.3.1(b) and 10.4.2 hereof, and (D) the amounts actually paid to Kirin by Medarex pursuant to Section 10.7.5(c)(i) and 10.7.5(c)(ii) hereof. 10.1.3 Collaboration Products in Development [*]. In the event that Kirin, pursuant to Section 10.7.5(c)(i) hereof, [*] with respect to any Collaboration Product developed in connection with a Kirin Partner Project, and any such Collaboration Product has achieved [*] described in [*] of the [*] hereof (each, a [*]) as of [*], then by [*], Kirin shall (a) provide to Medarex notice of the [*] with respect to each such Collaboration Product, and (b) make a payment to Medarex in the amount (the "Reconciliation Amount"), if any, by which X exceeds Y, whereby: (i) X is the [*] that [*] pursuant to [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -96-


 [*] hereof through [*], had [*] with respect to such Collaboration Product been [*] the [*] to the [*] (as defined in this Section 10.1.3); and (ii) Y is the [*] pursuant to [*] hereof through [*], on account of [*] the [*] with respect to such Collaboration Product; provided, however, that for purposes of determining the amount owed by Kirin to Medarex pursuant to this Section 10.1.3 in connection with a Kirin Partner Project with a [*] with respect to a Collaboration Product, the Reconciliation Amount shall equal [*] of the [*] calculated for each [*], between (A) the [*] of (1) the amount that [*] pursuant to [*] hereof had the [*] for such [*] equaled the [*] for such [*], and (2) a fraction, the denominator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on the date provided in Section 10.14 hereof for identifying the applicable Kirin Designated Exchange Rate with respect to such Partner Payment (or if no Partner Payment is made with respect to such [*], the Kirin Designated Exchange Rate in effect on the [*] day after the end of the Calendar Quarter in which such [*] occurs), and the numerator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on the [*], and (B) the amount of the payment [*] pursuant to [*] hereof with respect to the [*], if any, related to such [*]. Payment of such amount by Kirin shall not affect Kirin's obligation to make payments to Medarex with respect to such Collaboration Product pursuant to Section 10.7.5(c)(i) or 10.7.5(c)(ii) hereof, as applicable. For purposes of this Section 10.1.3, [*] Notwithstanding the foregoing, however, in no event shall the total aggregate payment by Kirin to Medarex pursuant to Section 10.1.2 hereof and this Section 10.1.3 [*]. 10.2 Reservation License Fees. In the event that a Party exercises its rights under a Reservation License with respect to an Antigen pursuant to Section 4.2.2 or 4.2.3 hereof, as applicable, then such Party shall pay to the other Party a Reservation License Fee, subject to the terms and conditions of this Agreement. 10.2.1 In-House Projects. If a Party exercises its rights under a Reservation License in connection with an In-House Project, such Party shall be permitted to exercise rights under such Reservation License with respect to a particular Reservation Target during the [*] Reservation License Period and during [*] renewal periods pursuant to Section 4.2.4 hereof (for a total of up to [*] from the date of first exercise of such License with respect to such Reservation Target) [*] on account of such exercise. In the event that the Party exercising rights under such Reservation License renews such License [*] in accordance with the terms and conditions of Section 4.2.4 hereof, the Party exercising rights under such Reservation License shall pay to the other Party a Reservation License Fee in the amount of [*] with respect to the [*] renewal and an [*] with respect to [*] renewal, if any, which payment obligations shall accrue at such time as such Party exercises its rights under its Commercial License with respect to such Target and shall be payable within [*] days after the date of selection by such Party of such Target as a [*] Target, [*] Target, or [*] Target pursuant to Article V hereof; provided, however, that if such Party designates such Target as a [*] Target or an [*] Target pursuant to Section 5.2 or 5.4 hereof, as applicable, such [*] such Party with respect to such Target. For the avoidance of doubt, once a Party has exercised a Reservation License with respect to a particular Reservation Target and enjoyed the benefit of such exercise during the initial Reservation License Period (and up to [*] renewal periods) [*] in accordance with the terms of this Section 10.2.1, in the event that such Reservation License terminates or expires and such Party subsequently exercises its rights under a Reservation License with respect to the same Reservation Target pursuant to Section 4.2.2 or 4.2.3 hereof, the first Reservation License Period (and [*] renewal periods) and the [*] Reservation License Period (and [*] renewal periods) with respect to such Reservation Target shall be aggregated for purposes of determining whether such Party [*] on account of such exercise (and [*] in the event of renewals). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -97-


 10.2.2 Partner Projects. If a Party exercises its rights under a Reservation License in connection with a Partner Project, subject to Section 10.1.2 hereof, such Party shall pay to the other Party within [*] days after the exercise of such Reservation License (a) the [*] of (i) [*], and (ii) the amount that equals [*] of any amount paid to such Party (or its Affiliate) by its Partner as a reservation license fee (or its equivalent), with respect to any sublicense under such Reservation License granted in connection with a Partner Project involving a Partner Headquartered in such Party's Primary Promotional Area, calculated in U.S. Dollars on the basis of the Designated Exchange Rate in effect as of the date of payment pursuant to this Section 10.2.2; and (b) the [*] of (i) [*], and (ii) the amount that equals [*] of any amount paid to the Party (or its Affiliate) by its Partner as a reservation license fee (or its equivalent), with respect to any sublicense under such Reservation License granted in connection with a Partner Project that includes a Partner Headquartered in the other Party's Primary Promotional Area, converted into U.S. Dollars on the basis of the Designated Exchange Rate in effect as of the date of payment pursuant to this Section 10.2.2; provided, however, that if rights under a Reservation License are exercised by a Party in connection with a Partner Project involving a Partner Headquartered in such Party's Primary Promotional Area, such Party may request that [*] described above[*]; and provided, further that if rights under a Reservation License are exercised by a Party in connection with a Partner Project involving a Partner Headquartered in the other Party's Primary Promotional Area, such Party may request that the [*] described above, which [*], for the avoidance of doubt, Medarex hereby acknowledges that it has granted to Kirin [*] in relation to [*] by Kirin to Medarex hereunder with respect to each such sublicense for the [*] Reservation License Period, and a [*] renewal of such sublicense); and provided, further, that with respect to any sublicense under a Reservation License granted by Medarex to a [*] in connection with a Medarex Partner Project, Medarex shall be obligated to pay Kirin, in lieu of the amount set forth in clause (a) of this Section 10.2.2, the amount that [*] of the amount, if any, paid to Medarex (or its Affiliate) by such [*] as a reservation license fee (or its equivalent); and provided, further, that with respect to any sublicense under a Reservation License granted by Kirin to [*], the amount due from Kirin to Medarex pursuant to this Section shall be an amount equal to the [*] of (x) the amount calculated in clause (a)(ii) of this Section 10.2.2, and (y) the [*] and a fraction, the denominator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on [*] for identifying the applicable Kirin Designated Exchange Rate with respect to such payment, and the numerator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on the [*]. In the event that a Party exercises a Reservation License for the purpose of [*] relating to the use of Collaboration Mice to raise Antibodies to such Antigen(s), the other Party hereby agrees that in the event that, within [*] days after exercising a Reservation License for [*], the exercising Party [*] and provides notice thereof to the other Party, the Reservation License shall terminate as of the date of such notice and the other Party [*] the exercising Party under this Section 10.2.2 with respect to such Antigen(s). 10.3 Commercial License Fees. In the event that a Party exercises its rights under a Commercial License pursuant to Section 4.3 hereof, such Party shall pay to the other Party a Commercial License Fee in the amount[*] required pursuant to Section 10.3.1(a) or 10.3.1(b), subject to the terms and conditions of this Agreement. 10.3.1 Commercial License for In-House Projects and Partner Projects. (a) In-House Projects. If a Party exercises its rights under a Commercial License in connection with an In-House Project for an Antigen that is designated as a [*] Target, such Party shall pay to the other Party a [*] Commercial License Fee in the amount of [*] within [*] days after the date of designation of such Target as a [*] Target pursuant to Article V hereof. If a Party exercises its rights under a Commercial License in connection with an In-House Project for an Antigen that is designated as a [*] Target, such Party shall [*] with respect to such Commercial License. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -98-


 (b) Partner Projects. If a Party exercises its rights under a Commercial License in connection with a Partner Project, subject to Section 10.1.2 hereof, such Party shall pay to the other Party within [*] days after the exercise thereof (i) the [*] of (A) [*] and (B) the amount that equals [*] of the amount (which amount shall be [*] for purposes of this calculation by the amount of any [*] with respect to such License) paid to such Party (or its Affiliate) by its Partner as a commercial license fee (or its equivalent), with respect to any sublicense under such Commercial License granted in connection with a Partner Project involving a Partner Headquartered in such Party's Primary Promotional Area, converted into U.S. Dollars on the basis of the Designated Exchange Rate in effect as of the date of payment pursuant to this Section 10.3.1(b); and (ii) the [*] of (A) [*], and (B) the amount that equals [*] of the amount (which amount shall be [*] for purposes of this calculation by the amount of any [*] with respect to such License) paid to such Party by its Partner as a commercial license fee (or its equivalent), with respect to any sublicense under such Commercial License granted in connection with a Partner Project involving a Partner Headquartered in the other Party's Primary Promotional Area, calculated in U.S. Dollars on the basis of the Designated Exchange Rate in effect on date of payment pursuant to this Section 10.3.1(b); provided, however, that with respect to any sublicense under a Commercial License granted by Medarex to [*] in connection with a Medarex Partner Project, Medarex shall be obligated to pay Kirin, in lieu of the amount set forth in clause (i) of this Section 10.3.1(b) hereof, the amount that [*] the amount[*] paid to Medarex by such [*] as a commercial license fee (or its equivalent); and provided, further, that with respect to any sublicense under a Commercial License granted to [*], the amount due from Kirin to Medarex pursuant to this Section shall be an amount equal to the [*] of (x) the amount calculated in clause (i)(B) of this Section 10.3.1(b), and (y) the [*] and a fraction, the denominator of which is the Kirin Designated Exchange Rate for the purchase of United States Dollars with [*] in effect on [*] hereof for identifying the applicable Kirin Designated Exchange Rate with respect to such payment, and the numerator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect [*]. (c) [*] Commercial License Fee on Account of Certain Antibody Substitutions. In the event that either (i) Medarex or a Medarex Affiliate in connection with an In-House Project with respect to a [*] Target, or (ii) a Medarex Partner, during the course of development and/or commercialization of a particular Collaboration Product against a particular Commercial Target substitutes for the Collaboration Antibody contained in such Collaboration Product an Antibody raised against and with affinity for such Commercial Target using Medarex Mice, Kirin shall, within [*] days after receiving written notice thereof from Medarex, [*] as a [*] with respect to such Commercial Target pursuant to [*] hereof, as applicable, [*] pursuant to [*] hereof with respect to such [*]. (d) [*] on Account of Certain Antibody Substitutions. The Parties understand and agree that in the event that either (i) Medarex or a Medarex Affiliate in connection with a HuMAb Project with respect to an Antigen, or (ii) a Third Party with which Medarex has entered into a written agreement with respect to such HuMAb Project, during the course of development and/or commercialization of a particular Antibody Product containing an Antibody raised against and with affinity for such Antigen using Medarex Mice, [*] for [*] raised against and with affinity for such Antigen such that Medarex exercises rights or grants a sublicense under a Commercial License in accordance with this Agreement and [*], as applicable, Medarex shall pay to Kirin the amounts payable pursuant to Section 10.3.1(a) or 10.3.1(b) hereof, as applicable, in connection with such Commercial License. It is further understood and agreed by the Parties hereto that in the case of clause (ii) above and where such [*] described above, even if Medarex [*] when the Commercial License is sublicensed to such Third Party, Medarex shall [*] to [*] under Section [*] hereof by treating the [*], for the [*] granted by [*] with respect to the Antibody obtained using [*] Mice (and for which the [*] was [*]) as an amount [*] a [*] (or [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -99-


 its Affiliate) as a [*] (or its equivalent) with respect to a sublicense under the Commercial License for purposes of Section 10.3.1(b) hereof. 10.4 Antigen Exclusivity Fees. In the event that a Party exercises its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License pursuant to Section 4.3 hereof, such party shall pay to the other Party an Antigen Exclusivity Fee (which amount shall be in addition to any amount owed by such Party to the other Party pursuant to Section 10.3 hereof), as follows. 10.4.1 In-House Project. If a Party exercises its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License in connection with an In-House Project, such Party shall pay to the other Party a [*] Antigen Exclusivity Fee in the amount of [*] for each Antigen with respect to which exclusive rights are exercised by such Party, within [*] days after the exercise thereof. 10.4.2 Partner Project. If a Party exercises its rights under an Antigen Exclusive Commercial License or an Antigen Semi-Exclusive Commercial License in connection with a Partner Project, subject to Section 10.1.2 hereof, such Party shall pay to the other Party within [*] days after the exercise thereof [*] Antigen Exclusivity Fee in the amount of [*] for each Antigen with respect to which exclusive rights are exercised by such Party (on behalf of any of its Partners) in connection with a Partner Project; provided, however, that [*] Party [*] to the [*] Party the fee described in this Section 10.4.2 with respect to any Antigen selected on an exclusive basis (as confirmed by information in the applicable Antigen List) by or on behalf of a [*] pursuant to the applicable [*] governing a [*], which agreement was [*] the Effective Date and [*], and giving [*] to any [*] thereto [*] to the extent that such [*] the [*] that the Partner is entitled to [*] under the applicable [*] governing the applicable [*] (with respect to which [*] the Party that enters into such [*] shall [*] to the other Party an Antigen Exclusivity Fee pursuant to this Section 10.4.2); and provided, further, that [*] Party [*] to the [*] Party the fee described in this Section with respect to any Antigen selected on an exclusive basis (as confirmed by the information in the applicable Antigen List) by or on behalf of a [*] pursuant to a [*] even in the event that the [*] and such [*] such [*] or [*] a [*] to [*] the [*] with [*] with respect to such Antigen. 10.4.3 Medarex Internal Projects and Other Third-Party Agreements. In the event that Medarex reserves for itself the right to develop and commercialize any and all Antibodies and Antibody Products against a particular Antigen on an exclusive basis in connection with a Medarex Internal Project, as confirmed by the information on the Shared Exclusive Antigen List, or if Medarex grants to a Third Party rights under the Medarex Technology (but not the Kirin Technology or KM Patent Rights) to develop and commercialize any and all Antibodies and Antibody Products against a particular Antigen on an exclusive basis, including, without limitation, in connection with a HuMAb License Project or HuMAb Collaboration Project, as confirmed by the information on the Shared Exclusive Antigen List or the Medarex Restricted Antigen List, then with respect to each such Antigen, Medarex shall pay to Kirin a [*] Antigen Exclusivity Fee in the amount of [*] that Medarex [*] to Kirin [*] described in this Section with respect to any Antigen selected on an exclusive basis (as confirmed by the information in the applicable Antigen List) by or on behalf of any [*] pursuant to a [*] governing a [*], which agreement [*] with [*] and [*], and giving [*] to any [*] thereto [*] to the extent that such [*] the [*] that the [*] is entitled to [*] under the applicable [*] governing the applicable [*] (with respect to which [*] Medarex shall [*] to Kirin an Antigen Exclusivity Fee pursuant to this Section 10.4.3); and [*] to Kirin [*] described in this Section with respect to any Antigen selected on an exclusive basis (as confirmed by the information in the applicable Antigen List) by or on behalf of a [*] pursuant to a [*] governing a [*] and is [*] even in the event that [*] and such [*] such [*] or [*] a [*] to [*] with respect to such Antigen. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -100-


 10.5 [*] Target Milestone Payments. Subject to the terms and conditions set forth in this Agreement, each Party shall make the following payments to the other Party with respect to each [*] Target selected pursuant to Article V hereof: 10.5.1 Milestone Payments. Subject to the terms and conditions of Sections 10.5.2, 10.5.3, 10.5.4, 10.5.5, 10.5.6 and 10.5.7 hereof, the Designating Party shall make [*] to the other Party, within [*] days following achievement of the corresponding milestone event, as provided below: (a) In vivo Therapeutics. (i) Milestone Payments Owed by Kirin to Medarex. On a [*] Target Product-by-[*] Target Product basis, if Kirin is the Designating Party, with respect to each [*] Target Product intended for an In Vivo Therapeutic Application, Kirin shall make the following milestone payments to Medarex: Milestone Event [*] Target Product * [*] Target Product * [*] Target Product* [*] [*] [*] [*] * [*] Target Product intended for In Vivo Therapeutic Application (ii) Milestone Payments Owed by Medarex to Kirin. On a [*] Target Product-by-[*] Target Product basis, if Medarex is the Designating Party, with respect to each [*] Target Product intended for an In Vivo Therapeutic Application, Medarex shall make the following milestone payments to Kirin: Milestone Event [*] Target Product * [*] Target Product * [*] Target Product* [*] [*] [*] [*] * [*] Target Product intended for In Vivo Therapeutic Application [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -101-


 (iii) Order of Payment. For clarification purposes, the milestone amount payable with respect to any milestone event listed in Section 10.5.1(a)(i) or 10.5.1(a)(ii) hereof that is achieved by a Party [*] pursuant to this Agreement shall be the amount listed for the [*], even if such product was [*] of such Party to achieve [*] pursuant to this Agreement. By way of example and without limitation, if Kirin is the Designating Party and its [*] has achieved [*], and its [*] receives [*] would be payable to Medarex with respect to [*]. If the [*] subsequently receives [*] would be payable to Medarex. (b) Ex vivo Therapeutics. (i) Milestone Payments Owed by Kirin to Medarex. On a [*] Target Product-by-[*] Target Product basis, if Kirin is the Designating Party, with respect to each [*] Target Product intended for an Ex Vivo Therapeutic Application, Kirin shall make the following milestone payments to Medarex: Milestone Event [*] Target Product* [*] [*] * [*] Target Product intended for Ex Vivo Therapeutic Application (ii) Milestone Payments Owed by Medarex to Kirin. On a [*] Target Product-by-[*] Target Product basis, if Medarex is the Designating Party, with respect to each [*] Target Product intended for an Ex Vivo Therapeutic Application against such [*] Target, Medarex shall make the following milestone payments to Kirin: Milestone Event [*] Target Product* [*] [*] * [*] Target Product intended for Ex Vivo Therapeutic Application (c) Diagnostic Products. (i) Milestone Payments Owed by Kirin to Medarex. On a [*] Target Product-by-[*] Target Product basis, if Kirin is the Designating Party, with respect to each [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -102-


 Target Product intended for use in a Diagnostic Application, Kirin shall pay to Medarex the following [*]; provided, however, that such [*] shall be due [*]. (ii) Milestone Payments Owed by Medarex to Kirin. On a [*] Target Product-by-[*] Target Product basis, if Medarex is the Designating Party, with respect to each [*] Target Product intended for use in a Diagnostic Application, Medarex shall pay to Kirin the following [*]; provided, however, that such [*] shall be due [*]. (d) Reagent Products. (i) Milestone Payments Owed by Kirin to Medarex. On a [*] Target Product-by-[*] Target Product basis, if Kirin is the Designating Party, with respect to each [*] Target Product intended for use as a Reagent, Kirin shall pay to Medarex the following [*]; provided, however, that such [*] shall be due [*]. (ii) Milestone Payments Owed by Medarex to Kirin. On a [*] Target Product-by-[*] Target Product basis, if Medarex is the Designating Party, with respect to each [*] Target Product intended for use as a Reagent, Medarex shall pay to Kirin the following [*]; provided, however, that such [*] shall be due [*]. 10.5.2 Milestone Payments for Multiple [*] Target Products Containing the Same Collaboration Antibody. Subject to Section 10.5.3 hereof, it is understood and agreed that, in the event that a Party (or its Affiliate(s)), in connection with one or more In-House Projects, develops more than one Collaboration Product containing the same Collaboration Antibody as an active ingredient and such products are intended for the same type of product application (i.e., In Vivo Therapeutic Application, Ex Vivo Therapeutic Application, Diagnostic Application, or Reagent), for purposes of calculating any milestone payments owed by such Party to the other Party pursuant to Sections 10.5.1(a), 10.5.1(b), 10.5.1(c), and 10.5.1(d) hereof, as applicable, with respect to any such Collaboration Products that are designated as [*] Target Products, all such Collaboration Products shall be deemed to be one and the same Collaboration Product. If all such Collaboration Products are designated as [*] Target Products, the milestone payment for each milestone event shall be owed by the Party developing and commercializing such [*] Target Products [*] and shall be triggered at the time that the [*]. By way of example and without limitation, if Medarex [*] with respect to a [*] Target Product intended for an In Vivo Therapeutic Application, and such [*] Target Product contains a Collaboration Antibody, designated as Collaboration Antibody A for purposes of this example, Medarex shall make a milestone payment to Kirin pursuant to Section 10.5.1(a)(ii) totaling [*]. If Medarex [*] with respect to a [*] Target Product intended for an In Vivo Therapeutic Application and such [*] Target Product also contains Collaboration Antibody A, Medarex [*] a milestone payment to Kirin on account of the [*]. 10.5.3 Milestone Payments for [*] Target Product Containing More than One Collaboration Antibody. It is understood and agreed that, in the event that a [*] Target Product contains more than one Collaboration Antibody, for purposes of calculating any milestone payments owed by a Party to the other Party with respect to such [*] Target Product pursuant to Sections 10.5.1(a), 10.5.1(b), 10.5.1(c), and 10.5.1(d) hereof, as applicable, [*] milestone payments shall be owed by such Party for [*] as if each such Collaboration Antibody [*]; provided, however, that neither Party shall be required to treat any such Collaboration Antibody as [*] subject to [*] milestone payments if such Party, [*] has with respect to such [*] Target Product containing such Collaboration Antibody (a) paid to the other Party a milestone payment on account of [*] pursuant to Section 10.5.1(a), 10.5.1(b), 10.5.1(c), or 10.5.1(d) hereof, as the case may be, with respect to [*] containing such Collaboration Antibody, or (b) [*] with respect to a [*] Target Product containing such Collaboration Antibody. By way of example and without [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -103-


 limitation, if Medarex [*] with respect to a [*] Target Product intended for an In Vivo Therapeutic Application, and such [*] Target Product contains [*] for purposes of this example, Medarex shall make milestone payments to Kirin pursuant to Section 10.5.1(a)(ii) totaling [*]. If, on the other hand, Medarex [*] with respect to a [*] Target Product intended for an In Vivo Therapeutic Application, and such [*] Target Product contains [*] for purposes of this example, and Medarex makes a corresponding milestone payment to Kirin pursuant to Section 10.5.1(a)(ii) hereof totaling [*], and Medarex [*] with respect to a [*] intended for an In Vivo Therapeutic Application, and such [*] Target Product contained [*], Medarex shall make a milestone payment to Kirin pursuant to Section 10.5.1(a)(ii) hereof totaling [*] for such [*] Target Product. 10.5.4 Milestone Payments for [*] Target Product Containing a [*] Antibody. (a) It is understood and agreed that, in the event that a \ Party, during the course of development and/or commercialization of a particular [*] Target Product against a particular [*] Target and in accordance with the terms and conditions of Article IV hereof, [*], for purposes of calculating milestone payments owed by such Party to the other Party with respect to such [*] Target Products pursuant to Sections 10.5.1(a), 10.5.1(b), 10.5.1(c), and 10.5.1(d) hereof, as applicable, the [*] such that milestone payments that accrue and are paid prior to the [*] shall be deemed to have been paid with respect to the [*] and milestone payments triggered upon the occurrence of [*] shall be payable [*] Target Product. By way of example and without limitation, if Medarex [*] with respect to a [*] Target Product intended for an In Vivo Therapeutic Application and pays to Kirin a milestone payment in the amount of [*] pursuant to Section 10.5.1(a)(ii) hereof, and thereafter Medarex [*], Medarex [*] but [*] with respect to such [*] Target Product. (b) It is understood and agreed that, in the event that Medarex (or any of its Affiliates), during the course of development and/or commercialization of a particular [*] Target Product against a particular [*] Target, [*] the Collaboration Antibody contained in such [*] Target Product an Antibody raised against and with affinity for such [*] Target using Medarex Mice, from and after the date on which Medarex provides written notice thereof to Kirin, [*]. In addition, in the event that Medarex, [*], paid to Kirin a milestone payment(s) on account of Medarex's achieving a milestone event(s) with respect to the Collaboration Product pursuant to Section 10.5.1(a)(ii), 10.5.1(b)(ii), 10.5.1(c)(ii) or 10.5.1(d)(ii) hereof, upon Medarex's [*] with respect to [*] Antibody Product, Medarex shall provide notice thereof to Kirin and Kirin shall within [*] days of the receipt of such notice [*] the amount of the corresponding milestone payment, [*] pursuant to Section 10.1.2 hereof with respect to such milestone payment. For the avoidance of doubt, in the event that Medarex fails or otherwise does not achieve with respect to [*] Antibody Product [*] for the related Collaboration Product, Kirin [*] the corresponding milestone payment. (c) For the avoidance of doubt, it is further understood and agreed that, in the event that Medarex (or any of its Affiliates), during the course of development and/or commercialization of a particular Antibody Product containing an Antibody raised against and with affinity for a particular Antigen using Medarex Mice in connection with a HuMAb Project, [*] for such Antibody a Collaboration Antibody raised against and with affinity for such Antigen using Kirin Mice and/or KM-Mice, and [*], Medarex shall, subject to Article V hereof, designate the Antigen as a [*] Target or a [*] Target and provide written notice thereof to Kirin. In the event that Medarex designates such Antigen as a [*] Target and with respect to any [*] Target Product containing such substituted Collaboration Antibody achieves one or more of the milestone events set forth in Sections 10.5.1(a)(ii), 10.5.1(b)(ii), 10.5.1(c)(ii) or 10.5.1(d)(ii) hereof, as applicable, Medarex shall [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -104-


 10.5.5 Milestone Payments for [*] Target Product with Multiple Indications. It is understood and agreed that, in the event that a [*] Target Product is developed and/or approved for multiple indications within the same application (e.g., In Vivo Therapeutic Application), any milestone payments with respect to such [*] Target Product are payable [*] provided under Section 10.5.1(a), 10.5.1(b), 10.5.1(c), and 10.5.1(d) hereof, as applicable, upon the [*] with respect to the [*] Target Product. 10.5.6 Milestone Payments for a [*] Target Product with Multiple Applications. (a) In the event that a [*] Target Product is developed for both an In Vivo Therapeutic Application(s) and an Ex Vivo Therapeutic Application(s), (i) any [*] paid pursuant to Section 10.5.1(a) hereof, with respect to such [*] Target Product in connection with the achievement of a milestone event in an In Vivo Therapeutic Application [*] that becomes payable with respect to the achievement of the same milestone event in an Ex Vivo Therapeutic Application with respect to such [*] Target Product, and (ii) any prior milestone payment paid pursuant to Section 10.5.1(b) hereof, with respect to such [*] Target Product in connection with the achievement of a milestone event in an Ex Vivo Therapeutic Application [*] that becomes payable with respect to the achievement of the same milestone event in an In Vivo Therapeutic Application with respect to such [*] Target Product. (b) In the event that a [*] Target Product is developed for either an In Vivo Therapeutic Application(s) or an Ex Vivo Therapeutic Application(s), (i) any prior milestone payment paid pursuant to Section 10.5.1(a) or 10.5.1(b) hereof, with respect to such [*] Target Product in connection with the achievement of a milestone event in an In Vivo Therapeutic Application or Ex Vivo Therapeutic Application [*] that becomes payable with respect to the achievement of the same milestone event in a Diagnostic Application or for use as a Reagent directed at the same indication with respect to such [*] Target Product pursuant to Section 10.5.1(c) or 10.5.1(d) hereof, as the case may be; and (ii) any prior milestone payment paid pursuant to Section 10.5.1(c) or 10.5.1(d) hereof, with respect to such [*] Target Product in connection with the achievement of a milestone event in a Diagnostic Application or for use as a Reagent shall be [*] that becomes payable with respect to the achievement of the same milestone event in either an In Vivo Therapeutic Application or an Ex Vivo Therapeutic Application directed at the same indication with respect to such [*] Target Product pursuant to Section 10.5.1(a) or 10.5.1(b) hereof, as the case may be. For purposes of this Section 10.5.6(b), the amounts payable under Sections 10.5.1(c) and 10.5.1(d) hereof shall be deemed to be milestone payments in respect of [*]. By way of example and without limitation, if a [*] Target Product is [*] as a product intended for a Diagnostic Application and the [*] under Section 10.5.1(c) hereof have been made with respect thereto, and the same [*] Target Product subsequently receives a [*] for an In Vivo Therapeutic Application, the milestone payable under Section 10.5.1(a) hereof shall be [*] under Section 10.5.1(c) hereof for such [*] Target Product. If the same [*] Target Product subsequently is further sold as a Reagent, the milestone payable under Section 10.5.1(d) hereof with respect thereto shall be [*] the amount payable under Section 10.5.1(d) hereof. 10.5.7 [*]. Except as provided under Section 10.5.6 hereof, [*] payable under this Agreement [*] that may be due to a Party under this Agreement. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -105-


 10.6 In-House Project Royalties. Subject to the terms and conditions set forth in this Agreement, each Party shall pay to the other Party the following royalties based on worldwide aggregate Net Sales of each Collaboration Product resulting from an In-House Project: 10.6.1 [*] Target Royalties. (a) Royalties Owed by Kirin to Medarex. Kirin shall pay to Medarex with respect to sales of [*] Target Products arising from [*] Targets selected by Kirin pursuant to Section 5.2 hereof the sum of (i) [*] of Net Sales of such Collaboration Products; and, if applicable, (ii) such amount as [*] with respect to such sales. (b) Royalties Owed by Medarex to Kirin. Medarex shall pay to Kirin with respect to sales of [*] Target Products arising from [*] Targets selected by Medarex pursuant to Section 5.2 hereof [*] of Net Sales of such Collaboration Products. With respect to such sales, as between Medarex and Kirin, Medarex shall [*] for the [*] pursuant to [*], including, without limitation, to [*]. 10.6.2 [*] Target Royalties. (a) Royalties Owed by the Designating Party. The Designating Party shall pay to the other Party with respect to sales of a [*] Target Product selected by the Designating Party pursuant to Article V hereof (i) [*] of Net Sales of each such Collaboration Product sold for an In Vivo Therapeutic Application in each Calendar Year and [*] of Net Sales of each such Collaboration Product sold for an In Vivo Therapeutic Application in such Calendar Year; and (ii) [*] of Net Sales of each such Collaboration Product sold for an Ex Vivo Therapeutic Application, Diagnostic Application or a Reagent. (b) [*] 10.7 Partner Royalties and Partner Payments. 10.7.1 Partner Royalties Owed by Kirin to Medarex. (a) Subject to Section 10.1.2 hereof, Kirin shall pay to Medarex during the Term of this Agreement royalties on sales in Asia of each Collaboration Product resulting from a Kirin Partner Project sold for an In Vivo Therapeutic Application, as follows: [*] of the [*] of (i) the sum of (A) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (B) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts [*] for sales of such Collaboration Product in Asia during the corresponding period, in each case [*] with respect to such sales (and subject to Section 10.7.1(e) hereof); (b) Subject to Section 10.1.2 hereof, Kirin shall pay to Medarex during the Term of this Agreement royalties on sales in Asia of each Collaboration Product resulting from a Kirin Partner Project sold for an Ex Vivo Therapeutic Application, Diagnostic Application or as a Reagent, as follows, [*] of the [*] of (i) the sum of [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts [*] for sales of such Collaboration Product in Asia during the corresponding period, in each case [*] with respect to such sales (and subject to Section 10.7.1(e) hereof); (c) Subject to Section 10.1.2 hereof, Kirin shall pay to Medarex during the Term of this Agreement royalties on sales outside Asia of each Collaboration Product resulting from a Kirin [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -106-


 Partner Project sold for an In Vivo Therapeutic Application, as follows: [*] of the [*] of (i) the sum of (A) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (B) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts actually received by Kirin from a Partner for sales of such Collaboration Product outside Asia during the corresponding period, in each case [*] with respect to such sales (and subject to Section 10.7.1(e) hereof); and (d) Subject to Section 10.1.2 hereof, Kirin shall pay to Medarex during the Term of this Agreement royalties on sales outside Asia of each Collaboration Product resulting from a Kirin Partner Project sold for an Ex Vivo Therapeutic Application, Diagnostic Application or as a Reagent, as follows: [*] of the [*] of (i) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts [*] for sales of such Collaboration Product outside Asia during the corresponding period, in each case [*] with respect to such sales (and subject to Section 10.7.1(e) hereof); and (e) [*] the amounts payable by Kirin to Medarex pursuant to Sections 10.7.1(a), (b), (c), and (d) hereof, as applicable, [*] with respect to sales of each Collaboration Product resulting from a Kirin Partner Project [*] with respect to such sales. 10.7.2 Partner Royalties Owed by Medarex to Kirin. (a) Subject to Section 10.1.2 hereof, Medarex shall pay to Kirin during the Term of this Agreement royalties on sales in Asia of each Collaboration Product resulting from a Medarex Partner Project sold for an In Vivo Therapeutic Application, as follows: [*] of the [*] of (i) the sum of (A) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (B) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) amounts [*] for sales of such Collaboration Product in Asia during the corresponding period, in each case [*] with respect to such sales; (b) Subject to Section 10.1.2 hereof, Medarex shall pay to Kirin during the Term of this Agreement royalties on sales in Asia of each Collaboration Product resulting from a Medarex Partner Project sold for an Ex Vivo Therapeutic Application, Diagnostic Application or as a Reagent, as follows: [*] of the [*] of (i) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) amounts [*] for sales of such Collaboration Product in Asia during the corresponding period, in each case [*] with respect to such sales; (c) Subject to Section 10.1.2 hereof, Medarex shall pay to Kirin during the Term of this Agreement royalties on sales outside Asia of each Collaboration Product resulting from a Medarex Partner Project sold for an In Vivo Therapeutic Application, as follows: [*] of the [*] of (i) the sum of (A) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (B) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts [*] for sales of such Collaboration Product outside Asia during the corresponding period, in each case [*] with respect to such sales; (d) Subject to Section 10.1.2 hereof, Medarex shall pay to Kirin during the Term of this Agreement royalties on sales outside Asia of each Collaboration Product resulting from a Medarex [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -107-


 Partner Project sold for an Ex Vivo Therapeutic Application, Diagnostic Application or as a Reagent, as follows: [*] of the [*] of (i) [*] of net sales (as defined in the relevant Project Agreement governing the relevant Partner Project) of each such Collaboration Product sold in each Calendar Year, and (ii) the amounts [*] for sales of such Collaboration Product outside Asia during the corresponding period, in each case [*]. 10.7.3 Partner Payments Owed by Kirin to Medarex. Subject to Sections 10.1.2 and 10.7.5 hereof, Kirin shall pay to Medarex a share of the Kirin Partner Payments (other than Partner Payments that constitute a reservation license fee, commercial license fee or an exclusivity fee, or the equivalent of any of the foregoing) received by Kirin (and/or its Affiliates), as follows: (a) [*] of such Partner Payments received during the Term of this Agreement from Kirin Partners which are Headquartered in Asia; and (b) [*] of such Partner Payments received during the Term of this Agreement from Kirin Partners which are Headquartered in countries outside Asia. 10.7.4 Partner Payments Owed by Medarex to Kirin. Subject to Sections 10.1.2 and 10.7.5 hereof, Medarex shall pay to Kirin a share of the Medarex Partner Payments (other than Partner Payments that constitute a reservation license fee, commercial license fee or an exclusivity fee, or the equivalent of any of the foregoing) received by Medarex (and/or its Affiliates), as follows: (a) [*] of such Partner Payments received during the Term of this Agreement from Medarex Partners which are Headquartered in countries outside Asia; and (b) [*] of such Partner Payments received during the Term of this Agreement from Medarex Partners which are Headquartered in Asia; provided, however, that with respect to any such Partner Payments received by Medarex (and/or its Affiliates) during the Term of this Agreement pursuant to the terms of any [*], Medarex shall [*] to pay Kirin [*] of such Partner Payments. 10.7.5 [*] Partner Payments. The [*] amounts payable by a Party to the other Party pursuant to Section 10.7.3 or 10.7.4 hereof, as applicable, on account of Partner Payments received by such Party (and/or its Affiliates) in connection with any particular Partner Project with respect to each Collaboration Product intended for use as an In Vivo Therapeutic Application for which such Party's Partner has received a sublicense under a Commercial License shall be as follows: (a) [*] Partner Payments by Kirin to Medarex. Subject to Section 10.7.5(c), the [*] Partner Payment payable by Kirin to Medarex on account of Partner Payments in connection with any particular Partner Project with respect to any Collaboration Product shall be the greater of (i) the amount that would be owed by Kirin to Medarex pursuant to Section 10.7.3 hereof (before making adjustments pursuant to Section 10.1.2 hereof), and (ii) the amount calculated using the formula [*] in the case of Partner Payments received by Kirin (and/or its Affiliates) from Kirin Partners which are headquartered in countries outside Asia, and the amount calculated using the formula [*], in the case of Partner Payments received by Kirin (and/or its Affiliates) from Kirin Partners which are headquartered in Asia, where [*]. (b) [*] Partner Payments by Medarex to Kirin. Subject to Section 10.7.5(c), the [*] Partner Payment payable by Medarex to Kirin on account of Partner Payments in connection with any particular Partner Project with respect to any Collaboration Product shall be the greater of (i) the amount that would be owed by Medarex to Kirin pursuant to Section 10.7.4 hereof (before making adjustments pursuant to Section 10.1.2 hereof), and (ii) the amount derived by the formula [*], in the case of Partner Payments received by Medarex (and/or its Affiliates) from Medarex Partners which are headquartered in Asia, and the amount derived by the formula [*], in the case of Partner Payments received by Medarex (and/or its Affiliates) from Medarex Partners which are headquartered in countries outside Asia, where [*] has the same meaning as set forth in Section 10.7.5(a) hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -108-


 (c) Calculation and Timing of [*] Partner Payments. (i) In General. Except as provided in Section 10.7.5(c)(ii) hereof, the calculation of [*] Partner Payments shall be [*] with respect to each Collaboration Product until the receipt by the Paying Party from the Partner of the last milestone payment provided for by the applicable Project Agreement with respect to such Collaboration Product. Within [*] days of [*], the Paying Party shall calculate the [*] Partner Payment and the [*] (as defined below) for such Collaboration Product and provide notice thereof and support therefor to the Non-Paying Party. Subject to Section 10.1.2 hereof, the Paying Party shall, within [*] days after the end of the Calendar Quarter in which [*] is achieved, make a payment to the Non-Paying Party in the amount (the [*]), if any, by which the [*] Partner Payment calculated pursuant to Section 10.7.5(a) or 10.7.5(b) hereof, as applicable, [*] through the end of such Calendar Quarter by the Paying Party to the Non-Paying Party on account of Partner Payments relating to such Collaboration Product in accordance with Section 10.7.3 or 10.7.4 hereof, as applicable, which payment for purposes of this Agreement shall be treated as a payment made pursuant to Section 10.7.3 or 10.7.4 hereof, as applicable; provided, however, that in the case of [*] as the Paying Party, if amounts owed by [*] pursuant to Section 10.7.4 hereof with respect to such Collaboration Product are [*] pursuant to Section 10.1.2 hereof, for purposes of this Section 10.7.5(c)(i), such [*] pursuant to Section 10.7.4 hereof in connection with such Collaboration Product, if such [*] pursuant to Section 10.1.2 hereof had not been made; and provided, further, that in the case of the [*] Partner Payment on account of Partner Payments made to Kirin by a [*] in connection with a Partner Project with respect to a Collaboration Product, the [*] shall equal [*] of the [*], calculated for each [*], between (x) the [*], where [*] is the payment [*], and a fraction, the denominator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on the date provided in Section 10.14 hereof for identifying the applicable Kirin Designated Exchange Rate in respect of the Partner Payment, if any, for [*] the Kirin Designated Exchange Rate in effect on the [*] day after the end of the Calendar Quarter in which such milestone is achieved), and the numerator of which is the Kirin Designated Exchange Rate for purchase of United States Dollars with [*] in effect on the [*], and (y) the amount of the payment by Kirin to Medarex pursuant to Section 10.7.3 hereof in respect of such Partner Payment. A sample calculation of the [*] in the case of a Partner Project with a [*] is attached hereto as Exhibit E. If, after the Paying Party makes a payment to the Non-Paying Party pursuant to this Section 10.7.5(c)(i), the Paying Party receives from the Partner that has rights to Exploit such Collaboration Product additional amounts that would trigger a payment by the Paying Party to the Non-Paying Party pursuant to Section 10.7.3 or 10.7.4 hereof, as applicable, the amount paid by the Paying Party to the Non-Paying Party pursuant to this Section 10.7.5(c)(i) shall [*] those [*] amounts that would otherwise be owed by the Paying Party to the Non-Paying Party pursuant to Section 10.7.3 or 10.7.4 hereof, as applicable. (ii) Converted or Discontinued Collaboration Products. In the event that (a) a Partner Project with respect to a Collaboration Product converts to an In-House Project pursuant to Section 7.2 hereof [*]; (b) a Partner discontinues development and commercialization of a Collaboration Product [*]; or (c) the Paying Party has a reasonable basis to believe that such Partner [*] (each such period a [*]), the Paying Party shall provide to the other Party notice thereof. In any such event, the Parties shall use the formulas set forth in Section 10.7.5(a) hereof for purposes of calculating the [*] Partner Payment with respect to such Collaboration Product, except that, in lieu of the meaning assigned thereto in Section 10.7.5(a), [*] the conversion of the Partner Project to an In-House Project, the discontinuation of development and commercialization of such Collaboration Product or the end of the [*] for such Collaboration Product, as the case may be. Subject to Section 10.1.2 hereof, the Paying Party shall, within [*] days after the date that marks the end of the Calendar Quarter in which such conversion of Partner Project to In-House Project or such discontinuation occurs or the end of the [*] with respect to such Collaboration Product, as the case may be, make a payment to the Non-Paying Party in the amount, if any, by which the [*] Partner Payment [*] paid through the end of such Calendar Quarter by the Paying [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -109-


 Party to the Non-Paying Party on account of Partner Payments with respect to such Collaboration Product in accordance with Section 10.7.3 or 10.7.4 hereof, as applicable, which payment for purposes of this Agreement shall be treated as a payment made pursuant to Section 10.7.3 or 10.7.4 hereof, as applicable; provided, however, that in the case of [*] as the Paying Party, if amounts owed by [*] pursuant to Section 10.7.4 hereof with respect to such Collaboration Product are [*] pursuant to Section 10.1.2 hereof or, in the case of a [*], pursuant to Section 10.7.4 hereof, for purposes of this Section 10.7.5(c)(ii), such [*] pursuant to Section 10.7.4 hereof in connection with such Collaboration Product, if such [*] pursuant to Section 10.1.2 hereof had not been made. If, after the Paying Party makes such payment to the Non-Paying Party pursuant to this Section 10.7.5(c)(ii), development and commercialization of such Collaboration Product is resumed by such Partner or the In-House Project into which the Partner Project had converted converts back to a Partner Project, the Paying Party [*] to the other Party in accordance with Section 10.7.3 or 10.7.4 hereof, as applicable, and shall be subject to the terms of Section 10.7.5(c)(i) hereof with respect to [*] Partner Payments, except that the amount, if any, paid by the Paying Party to the Non-Paying Party pursuant to this Section 10.7.5(c)(ii) [*] the amount due from the Paying Party to the Non-Paying Party pursuant to Section 10.7.5(c)(i) hereof, if any. The obligation set forth in this Section 10.7.5(c)(ii) shall [*] of any Commercial License that has been granted in connection with the Partner Project to which such Collaboration Product relates. 10.7.6 [*] on Account of Certain Antibody [*]. (a) It is understood and agreed that, in the event that a Medarex Partner, during the course of development and/or commercialization of a particular Collaboration Product against a particular Commercial Target, substitutes for the Collaboration Antibody contained in such Collaboration Product an Antibody raised against and with affinity for such Commercial Target using Medarex Mice, from and after the date on which Medarex provides written notice thereof to Kirin, [*] amounts received by Medarex from such Medarex Partner in connection with such Antibody Product. In addition, in the event that Medarex, prior to the Medarex Partner's making such substitution, received from such Medarex Partner one or more Medarex Partner Payments related to the achievement by such Medarex Partner of a milestone event(s) with respect to the Collaboration Product (and Medarex made a corresponding payment(s) to Kirin pursuant to Section 10.7.4 hereof), upon the Medarex Partner's achieving an equivalent milestone event with respect to such modified Antibody Product, Medarex shall provide notice thereof to Kirin [*] that corresponded to such milestone event, [*] pursuant to Section 10.1.2 hereof with respect to such Medarex Partner Payment. For the avoidance of doubt, in the event that the Medarex Partner fails or otherwise does not achieve with respect to such modified Antibody Product a milestone event equivalent to a milestone event achieved with respect to the Collaboration Product prior to the Antibody substitution (and with respect to which Medarex made a payment to Kirin pursuant to Section 10.7.4 hereof), [*]. (b) It is further understood and agreed that, in the event that a Third Party with which Medarex enters into a written agreement with respect to a HuMAb Project, during the course of development and/or commercialization of a particular Antibody Product containing an Antibody raised against and with affinity for a particular Antigen using Medarex Mice, [*] for such Antibody a Collaboration Antibody raised against and with affinity for such Antigen using Kirin Mice and/or KM-Mice, thereby resulting in Medarex's exercising rights, and/or granting a sublicense, under a Commercial License in accordance with the terms and conditions of this Agreement, [*], Medarex shall provide written notice thereof to Kirin and [*]. If, pursuant to the relevant Project Agreement, [*] in connection with the Collaboration Product is [*] prior to the [*], the amount [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -110-


 10.8 Equity Investments by a Party in Connection with Partner Projects. 10.8.1 In General. If a Contracting Party enters or is considering entering into a Project Agreement governing a Partner Project pursuant to which the Contracting Party would receive securities (other than in exchange for a monetary payment at or above fair market value) from an Issuer as full or partial consideration for the rights granted by the Contracting Party to the Issuer pursuant to such agreement, and the issuance of such securities to the Contracting Party in consideration for the respective rights would trigger a corresponding payment obligation requiring the Contracting Party to make a payment to the Non-Contracting Party pursuant to this Agreement based on the consideration received for the respective rights, then the Contracting Party shall have the right, at its election and subject to applicable law, to offer the Non-Contracting Party the right to receive a portion of such securities in lieu of cash in full or partial discharge (as the case may be) of the payment obligation of the Contracting Party to the Non-Contracting Party pursuant to the terms and conditions of this Article X. For the avoidance of doubt, the Non-Contracting party shall in any event have the sole discretion to choose to accept the Contracting Party's offer of a portion of such securities or to reject the offer and receive only cash in payment of any and all obligations hereunder. (a) If, prior to entering into a Project Agreement that provides for the issuance of securities, the Contracting Party desires to determine whether the Non-Contracting Party would agree to receive a portion of such securities in lieu of cash that would be due to the Non-Contracting Party from the Contracting Party under this Agreement, the Contracting Party shall provide written notice to that effect to the Non-Contracting Party, indicating in such notice the identity of the Issuer, the unit price of the respective securities and other relevant rights and preferences relating to such securities. Further, if the Contracting Party has [*] issued or to be issued by the Issuer, it shall [*] to the Non-Contracting Party; provided, however that the Contracting Party shall [*] for the Non-Contracting Party unless any [*] of the respective securities, in which case the Contracting Party shall promptly provide the Non-Contracting Party with an amended notice reflecting the [*]. If the Non-Contracting Party desires to receive a portion of such securities (calculated according to Section 10.8.2 hereof) in lieu of cash in full or partial discharge (as the case may be) of the payment obligation of the Contracting Party to the Non-Contracting Party in connection with each such issuance of securities to the Contracting Party, the Non-Contracting Party shall provide written notice to the Contacting Party within ten (10) business days from receipt by the Non-Contracting Party of the notice provided to it pursuant to the first sentence of this Section 10.8.1(a) or in the event of an amended notice provided as set forth in this Section 10.8.1(a), within [*] business days from receipt by the Non-Contracting Party of such amended notice. (b) If at any time after entering into a Project Agreement that provides for the issuance of securities to the Contracting Party as consideration for some or all of the rights granted by the Contracting Party to the Issuer, the Contracting Party desires to offer a portion of such securities to the Non-Contracting Party, the Contracting Party shall provide written notice to the Non-Contracting Party, and inform the Non-Contracting Party of the identity of the Issuer, the per unit price and other relevant rights and preferences relating to such securities. If the Contracting Party has [*] issued or to be issued by the Issuer, it shall [*] to the Non-Contracting Party; provided, however that the Contracting Party shall [*] for the Non-Contracting Party unless any [*] of the respective securities, in which case the Contracting Party shall promptly provide the Non-Contracting Party with an amended notice reflecting the [*]. In the event that the Non-Contracting Party desires to obtain a separate valuation, it may do so [*]. If the Non-Contracting Party desires to receive a portion of such securities (calculated according to Section 10.8.2 hereof) in lieu of cash in full or partial discharge (as the case may be) of the payment obligation of the Contracting Party to the Non-Contracting Party in connection with each such issuance of securities to the Contracting Party, the Non-Contracting Party shall provide written notice to the Contacting Party within [*] business [*] days from receipt of the notice provided by the Contracting Party to the Non-Contracting [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -111-


 Party pursuant to this Section 10.8.1(b) or in the event of an amended notice provided as set forth in this Section 10.8.1(b), within [*] business [*] business days from receipt by the Non-Contracting Party of such amended notice. (c) In the event that the Non-Contracting Party provides timely notice to the Contracting Party of its desire to receive a portion of such securities pursuant to Section 10.8.1(a) or 10.8.1(b) hereof, then the Contracting Party, at its election, shall attempt to negotiate an agreement with the Issuer whereby the Issuer will issue directly to the Non-Contracting Party securities in an amount calculated in accordance with Section 10.8.2 hereof, or upon receipt by the Contracting Party of securities from the Issuer, the Contracting Party shall take all steps reasonably within the control of the Contracting Party to transfer to the Non-Contracting Party securities in an amount calculated in accordance with Section 10.8.2 hereof. If (i) the Issuer declines to issue such securities directly to the Non-Contracting Party or the transfer of such securities by Contracting Party to Non-Contracting Party is not permitted by the terms of its agreement with the Issuer and the Contracting Party has requested that the Issuer consent to or waive any contractual restrictions on the transfer of such securities by Contracting Party to Non-Contracting Party, and the Issuer has declined to provide such consent and/or waive such restrictions, as applicable, or (ii) the Contracting Party is not permitted under applicable law to transfer such securities to the Non-Contracting Party, then the Contracting Party shall have no further obligation pursuant to this Section 10.8.1 and any payments owed by the Contracting Party to the Non-Contracting Party in connection with the issuance to the Contracting Party of such securities by the Issuer shall be paid by the Contracting Party to the Non-Contracting Party in cash pursuant to the terms of Section 10.13.1 hereof. 10.8.2 Calculation of Non-Contracting Party's Equity Interest. In the event that the Non-Contracting Party elects pursuant to Section 10.8.1(a) or 10.8.1(b) hereof, as applicable, to receive a portion of the securities issued by the Issuer to the Contracting Party as full or partial discharge (as the case may be) of the payment obligation of the Contracting Party to the Non-Contracting Party in connection with the rights granted in the Project Agreement, and if the requirements of Section 10.8.1(c) are satisfied, then the Non-Contracting Party shall receive a portion of any such securities issued to the Contracting Party for which the Contracting Party has a corresponding payment obligation to the Non-Contracting Party, which portion shall be the [*] of [*] that equals the product of the [*] the [*] and a fraction, the numerator of which shall be an amount equal to the [*] that [*] to the [*] pursuant to the [*] of [*] on account of [*] to the [*] in connection with each payment, and the denominator shall be the total cash value of the consideration (including securities, cash or other value) provided by the Issuer to the Contracting Party in connection with such payment. For purposes of this Section 10.8.2, the cash value of securities and other non-cash assets shall equal the [*] in the [*] that [*] to the Non-Contracting Party pursuant to this Section 10.8. Upon request, the Contracting Party shall promptly provide the Non-Contracting Party with [*] in such Contracting Party transaction. 10.8.3 No Obligation to Accept Equity. Nothing in this Section 10.8 shall require the Contracting Party to enter into an agreement with an Issuer, or to accept securities from an Issuer as consideration for rights granted by the Contracting Party to an Issuer pursuant to a Project Agreement. 10.9 In-House Project Royalty, Partner Royalty and Partner Payment Terms. 10.9.1 In-House Project Royalties. With respect to the royalty rates for Collaboration Products resulting from In-House Projects, the Parties acknowledge and agree that the Patent Rights and Know-How licensed pursuant to this Agreement justify royalty rates of differing amounts with respect to sales of such Collaboration Products, which rates could be applied separately to Collaboration Products involving the exercise of such Patent Rights and/or the incorporation of such Know-How, and that if such royalties were calculated separately, royalties relating to Patent Rights and royalties relating to Know [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -112-


 How would last for different terms. The Parties have determined in light of such considerations and for reasons of convenience that blended royalty rates for the Patent Rights and the Know-How licensed hereunder will apply during a single royalty term (which blended royalty rates would be advantageous to both Parties). Consequently, the Parties have agreed to adopt the royalty rates set forth in Section 10.6 hereof. Each Party's respective royalty obligations under Section 10.6 hereof shall terminate, on a country-by-country basis, with respect to each Collaboration Product on the later to occur of (a) the expiration date in such country of the last to expire of any issued patent that includes at least one Valid Claim Controlled by the Party to which payment is owed that covers the sale of such Collaboration Product or the use of the Collaboration Mouse to obtain such Collaboration Product in such country, and (b) the [*] of such Collaboration Product in such country, unless earlier terminated in accordance with Article XIV hereof; provided, however, that in the event that any such Collaboration Product is being [*] in the [*], if [*] to [*] amounts, the [*] from its [*] after any applicable [*] and the [*] of the [*] of such [*] has occurred in any such [*], once the applicable [*] such Party shall [*] have an [*] to the [*] after the [*] of the [*] of [*] with respect to Net Sales of such Collaboration Product in such country(ies). 10.9.2 Partner Royalties and Payments. Except as otherwise provided in Section 10.1.2 hereof, each Party's respective obligations, under Sections 10.7.1 and 10.7.2 hereof with respect to Partner Royalties (and/or the payment of certain [*] amounts related to sales of Collaboration Products by a Partner, as the case may be) and under Sections 10.7.3 and 10.7.4 hereof with respect to Partner Payments, shall apply with respect to [*] (and [*]) conducted pursuant to [*] entered into by a Party (and/or its Affiliate) and a [*], and such [*] shall [*] apply even in the event that this [*] (provided that such [*] a [*] hereunder pursuant to Section [*] hereof (or a [*] a [*] pursuant to the terms of the relevant [*], as applicable)); provided, however, that with respect to any such Partner Project, each Party's respective obligations under Section 10.7.1, 10.7.2, 10.7.3 and 10.7.4 shall [*] apply [*] only for so long as such [*] and [*] pursuant to the terms of such [*]. Notwithstanding anything contained in this Agreement to the contrary, Kirin's obligation under Section 10.7.1(e) hereof, to [*] with respect to sales of each Collaboration Product resulting from a Kirin Partner Project such [*] as the [*] with respect to such sales, shall continue for so long as [*]. 10.10 Partner Payments and Royalty Payments Periods. Amounts owed by a Party to the other Party as Royalties on Net Sales of [*] Target Products and [*] Target Products and on account of Partner Payments and Partner Royalties shall be calculated in accordance with generally accepted accounting principles, consistently applied, and with the terms of this Article X. 10.10.1 In-House Project Royalties. Royalties payable by one Party to the other Party on Net Sales of [*] Target Products and [*] Target Products shall be payable on a quarterly basis, within [*] days after the end of each Calendar Quarter, based upon the Net Sales during such Calendar Quarter, commencing with [*] of a Collaboration Product is made. 10.10.2 Partner Royalties and Payments. Amounts owed by a Party to the other Party on account of Partner Payments and Partner Royalties shall be payable on a [*], within [*] days after the [*] in which the paying Party receives such Partner Payments and Partner Royalties from its Partner(s), commencing with the [*] in which this Agreement becomes effective, except that amounts owed by a Paying Party to the Non-Paying Party pursuant to Section 10.7.5 in connection with [*] Partner Payment obligations shall be payable as provided in Sections 10.1.3, 10.7.5(c)(i) and 10.7.5(c)(ii) hereof, as applicable. 10.11 Statements. Each payment made by a Party pursuant to this Agreement shall be made in accordance with Section 10.13.1 hereof and shall be accompanied by a statement that conforms to this Section 10.11. In the case of any payment made by a wire service, the paying Party shall [*] by the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -113-


 paying Party. Each statement shall show in detail: (a) in the case of payments on account of Partner Payments and Partner Royalties, (i) the amount of the payment owed by the paying Party to the other Party, (ii) an identification of the agreement pursuant to which the Partner Payments and Partner Royalties were made, (iii) the Collaboration Product, if any, to which such payments relates, and (iv) in the case of Partner Royalties, the calculation of royalties due from the Partner to the Party, including the net sales calculation pursuant to the Project Agreement governing such Partner Project; and (b) in the case of royalties on Net Sales of any [*] Target Product or [*] Target Product, any (i) Net Sales, (ii) the number of units of each Collaboration Product sold by the paying Party (and its Affiliates, licensees, and sublicensees) on a country-by-country basis during the applicable Calendar Quarter, and (iii) the amount and calculation of royalties due on such Net Sales, including a description of any and all offsets or credits deducted therefrom. In addition to the information required by the preceding sentence, in the event that a Party (or an Affiliate thereof) [*], which [*] constitutes a [*], in the case of any such [*] received by Medarex (and/or its Affiliates), or a [*], in the case of any such [*] received by Kirin (and/or its Affiliates), the Party receiving such [*] from its [*] (either directly or indirectly through an Affiliate) shall indicate in the corresponding statement provided to the other Party pursuant to this Section 10.11 (x) the [*], and (y) the [*]. In the event of a disagreement between the Parties with respect to the [*], the Party receiving such [*] from its Partner (either directly or indirectly through its Affiliates) shall retain a Third Party, acceptable to the other Party, to perform [*], the [*] by the Parties, and the results of which shall be binding on the Parties. Notwithstanding anything contained in this Section 10.11, in the event that a Party receives any [*], if the Project Agreement provides for the [*] in such [*] shall be [*] for purposes of this Agreement. 10.12 Records Retention; Audit. 10.12.1 Record Retention. Until the third (3rd) anniversary of the Calendar Quarter in which a Collaboration Product is sold, the selling Party shall keep (and shall ensure that its Affiliates and, with respect to any Project Agreements governing Partner Projects and/or In-House Projects and is entered into after the Effective Date, its Partners and In-House Collaborators, shall keep) records of such sales in sufficient detail to confirm the accuracy of the payments made by a Party to the other Party pursuant to this Article X. 10.12.2 Audit. Upon the written request of the receiving Party and [*], the paying Party shall permit an independent certified public accounting firm of nationally recognized standing selected by the receiving Party, and reasonably acceptable to the paying Party, at the receiving Party's expense, to have access during normal business hours, and upon reasonable prior written notice, to such of the records of the paying Party as may be reasonably necessary to verify the accuracy of the payments made by the paying Party to the other Party hereunder for any Calendar Year ending [*] to the date of such request. The accounting firm shall disclose to the paying Party and the receiving Party whether the payments are correct or incorrect and the specific details concerning any discrepancies, including any underlying data to the extent that the receiving Party may reasonably require access to it in order to enforce its rights under this Agreement. 10.12.3 Payment of Additional Amounts. If such accounting firm concludes that additional amounts were owed during such period, the paying Party shall pay the additional amounts, with interest from the date originally due at the rate of one and a half percent (1.5%) per month, within [*] days after the date on which such accounting firm's written report is delivered to the paying Party; provided however, if the payment of interest at such rate is not permitted or enforceable under the laws or regulations of [*], the paying Party shall be deemed to satisfy the interest requirement under this Section by paying to the other Party the maximum interest attainable by law for the applicable period. If, and [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -114-


 only if, the amount of the underpayment is five percent (5%) or greater for the period under audit, then the paying Party shall reimburse the receiving Party for all costs related to such audit. 10.12.4 Confidentiality. Except to the extent reasonably necessary to enforce its rights under this Agreement, the receiving Party shall treat all information subject to review under this Section 10.12 in accordance with the confidentiality provisions of Article XIII and shall cause the accounting firm conducting the audit under this Section 10.12 to enter into a reasonably acceptable confidentiality agreement with the paying Party obligating such firm to retain all such financial information in confidence pursuant to such confidentiality agreement. 10.13 Mode of Payment and Withholding and Similar Taxes. 10.13.1 Mode of Payment. Except for payments made in the form of securities pursuant to Section 10.8 hereof, all payments by either of the Parties to the other Party under this Agreement shall be made [*] in the requisite amount to such [*] as the receiving Party may from time to time designate by notice to the paying Party, calculated as necessary pursuant to Section 10.14 hereof. For purposes of Section 10.8 hereof, the Contracting Party shall promptly (or shall cause Issuer to promptly) transfer to Non-Contracting Party the appropriate certificates and/or other forms of documentation evidencing the portion of the securities issued by Issuer to Contracting Party which the Non-Contracting Party has elected to receive thereunder. 10.13.2 Withholding and Similar Taxes. Notwithstanding any provision of this Agreement, all payments remitted by either of the Parties to the other Party will be reduced by the applicable withholding taxes or similar charges imposed by any government in the applicable taxing jurisdiction and proof of payment of such taxes or charges shall be secured and sent to the such other Party as evidence of such payment. All amounts paid by a Party pursuant to this Section 10.13.2 shall be paid for the account of such other Party and deducted from the amounts due to such other Party pursuant to the terms of this Agreement. 10.14 Payments in Other Currencies. Subject to Sections 10.1.3, 10.2.2, 10.3.1(b), and 10.7.5(c), in connection with royalties on sales of [*] Target Products and [*] Target Products outside the United States, and payments between the Parties on account of Partner Payments and Partner Royalties received by a Party from a Partner in currencies other than United States Dollars, payments between the Parties shall be calculated based on the [*] (a) in which such sales occur, in the case of royalties on sales of [*] Target Products and [*] Target Products, and (b) in which such Partner Payments and Partner Royalties are received by the Party from a Partner, in the case of Partner Payments and Partner Royalties. If by law, regulation, or fiscal policy of a particular country, conversion into United States dollars or transfer of funds of a convertible currency to the United States is restricted or forbidden, the paying Party shall give the receiving Party prompt written notice of such restriction, which notice shall satisfy the [*] payment deadline described in Section 10.10.1, 10.10.2 or 10.12.3 hereof, as applicable. The paying Party shall pay any amounts due to the receiving Party by depositing such payment in local currency to the credit of the receiving Party in a recognized banking institution or trust company selected by the receiving Party and identified by written notice to the paying Party, and such deposit shall fulfill all obligations of the paying Party to the receiving Party with respect to such payment. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -115-


 ARTICLE XI RESEARCH AND COLLABORATION RELATING TO JOINT TECHNOLOGY 11.1 Research and Research Reports. Medarex and Kirin acknowledge and agree that, in accordance with Section 16(a) of the Agreement on Essential Terms for Collaboration, Medarex has conducted research relating to KM-Mice and has provided to Kirin four reports relating to Medarex's research findings, with the final report having been delivered by Medarex to Kirin on or about September 30, 2001. As a result of Medarex's submission to Kirin of such reports, the entire Initial Fee has been fully earned by Medarex and no portion of such fee shall be refundable or creditable. 11.2 Collaboration Meetings for Development of Medarex, Kirin and Joint Technologies. During the Term of this Agreement, the Parties shall participate in biannual joint meetings to confer on the collaboration under this Agreement with respect to the Kirin Technology, Medarex Technology, and technology relating to KM-Mice, KM Patent Rights, and KM Know-How, and regarding the continued efforts of the Parties, if any, with respect to the development of the Technologies licensed pursuant to this Agreement. To the extent required pursuant to Section 6.5.2 hereof, and to the extent permitted by applicable law and the terms of applicable agreements with Third Parties, each Party's representative shall share with the other Party's representative: (a) general information regarding any Project Agreement governing one or more Partner Projects and/or In-House Projects, (and, in the case of Medarex, HuMAb License Projects and HuMAb Collaboration Agreements) entered into with a Third Party; (b) the identity of such Third Party; (c) general information about systems being utilized by such Third Party to develop products, whether or not such development is complete; and (d) the general nature of any products developed by such Third Party through use of technology licensed to it under such agreement. Any information shared by a Party's representative with the other Party's representative pursuant to this Section 11.2 shall be deemed Confidential Information of the disclosing Party subject to the terms and conditions of Article XIII hereof. The designated location for such meeting shall alternate between Japan and the United States, or as otherwise agreed by the Parties, and shall be attended by one or more representatives of both Kirin and Medarex as each Party shall in its sole discretion determine. Each Party shall bear its own expenses relating to attendance at and participation in joint meetings. ARTICLE XII INTELLECTUAL PROPERTY RIGHTS 12.1 Intellectual Property Ownership. 12.1.1 Ownership of Medarex Technology and Medarex Trademarks. This Agreement shall not affect the extent of Medarex's ownership of the Medarex Mice (and any Mice Materials derived therefrom), Medarex Patent Rights, Medarex Know-How, and Medarex Trademarks. Kirin hereby admits the validity of the Medarex Trademarks, agrees not to challenge the Medarex Trademarks, and agrees that any and all rights that may be acquired by the use of the Medarex Trademarks, including any goodwill symbolized thereby, shall inure to the sole benefit of Medarex. 12.1.2 Ownership of Kirin Technology and Kirin Trademarks. This Agreement shall not affect the extent of Kirin's ownership of the Kirin Mice (and any Mice Materials derived therefrom), Kirin Patent Rights, Kirin Know-How, and Kirin Trademarks. Medarex hereby admits the validity of the Kirin Trademarks, agrees not to challenge the Kirin Trademarks, and agrees that any and all rights that may be acquired by the use of the Kirin Trademarks, including any goodwill symbolized thereby, shall inure to the sole benefit of Kirin. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -116-


 12.1.3 Ownership of Improvements. Except as set forth in Section 12.1.4 hereof, and without the payment of additional consideration, (a) Medarex agrees to disclose promptly in writing and assign to Kirin any and all intellectual property rights of Medarex in or to Improvements to the TC Mice or HAC Mice (but excluding any such Improvement that also constitutes an Improvement to the Medarex Mice) that are (i) conceived, reduced to practice, or otherwise developed by or on behalf of Medarex or any Medarex Affiliate during the period beginning on December 27, 1999, and ending on the last day of the Term, or (ii) assigned to Medarex by any of its Partners or In-House Collaborators in accordance with the terms and conditions of Section 8.6.3(a) hereof; and (b) Kirin agrees to disclose promptly in writing and assign to Medarex, without the payment of additional consideration, any and all intellectual property rights of Kirin in or to Improvements to the Medarex Mice (but excluding any such Improvement that also constitutes an Improvement to the TC Mice or HAC Mice) that are (i) conceived, reduced to practice, or otherwise developed by or on behalf of Kirin or any Kirin Affiliate during the period beginning on December 27, 1999, and ending on the last day of the Term, or (ii) assigned to Kirin by any of its Partners or In-House Collaborators in accordance with the terms and conditions of Section 8.6.3(a) hereof. It is understood and agreed, however, that in no event shall any (x) Collaboration Antibody, Collaboration Product, or Production Process Development, (y) Information and Inventions that would fall within the definition of "Excluded Claims" or "Excluded Know-How", or (z) KM-MouseTM or any Improvement thereto, conceived, reduced to practice, or otherwise developed by or on behalf of a Party (or any of its sublicensees) be deemed to be an Improvement to the TC Mice, HAC Mice or Medarex Mice subject to the assignment obligation set forth in this Section 12.1.3. 12.1.4 Ownership of KM Patent Rights, KM Know-How and KM Trademarks. As between the Parties, the Parties shall jointly and equally own any and all right, title, and interest in or to any KM Trademarks, KM Patent Rights and KM Know-How, and any Improvements to any of the KM Patent Rights and KM Know-How conceived, reduced to practice, or otherwise developed by or on behalf of either Party, or that are assigned to either Party by any of such Party's Partners or In-House Collaborators (or employees thereof) in accordance with the terms and conditions of Section 8.6.3(a) hereof; provided, however, that except as expressly permitted by the terms of this Agreement, neither Party may Exploit or disclose to or share with any Third Party any KM-MouseTM, KM Patent Rights, or KM Know-How during the Term of this Agreement without the express written consent of the other Party. Each Party agrees to disclose promptly in writing to the other Party any and all KM Know-How and KM Patent Rights, that are (a) conceived, reduced to practice, or otherwise developed by or on behalf of such Party during the period beginning on December 27, 1999, and ending on the last day of the Term, or (b) assigned to such Party by any of its Partners or In-House Collaborators (or employees thereof) in accordance with the terms and conditions of Section 8.6.3(a) hereof. In addition, the Party with an obligation to make such disclosures agrees, as necessary to evidence joint ownership of any and all such KM Patent Rights, to assign to the other Party, and/or to cause its employees to assign to the other Party, without payment of additional consideration, an equal, undivided interest in such KM Patent Rights (and the Information and Inventions on which any such KM Patent Rights are based). It is understood and agreed, however, that in no event shall any (y) Collaboration Antibody, Collaboration Product, or Production Process Development, or (z) Information and Inventions that would fall within the definition of "Excluded Claims" or "Excluded Know-How", be deemed to be subject to the assignment obligation set forth in this Section 12.1.4. 12.1.5 Ownership of Antibodies and Antibody Products. Subject to Section 12.2.5 hereof, as between the Parties, each Party shall own all right, title, and interest in and to any Antibodies, Antibody Products, Antibody Materials, and Information and Inventions related to any of the foregoing, invented, discovered, or developed by such Party resulting from the use of Collaboration Mice pursuant to this Agreement. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -117-


 12.1.6 Ownership of Production Process Technology. Notwithstanding the foregoing, each Party shall own and retain all right, title and interest in and to such Party's Production Process Technology, including any and all Information and Inventions with respect to such Production Process Technology (including any Improvements thereto) that are conceived, reduced to practice, discovered, developed or otherwise made, by or on behalf of such Party, its Affiliates or its sublicensees, whether or not patented or patentable, and any and all Patent Rights and other intellectual property rights with respect thereto. Except as the Parties may otherwise expressly agree, neither Party shall have any rights, express or implied, under this Agreement with respect to any Production Process Technology of the other Party and nothing in this Agreement is intended to or shall be interpreted as granting a Party any license to such Production Process Technology, whether subordinate or dominant to any other Technology. 12.2 Prosecution of Patents and Trademarks. 12.2.1 Medarex Rights. (a) In General. As between the Parties, Medarex shall have the sole right, at its sole cost and expense, to prepare, file, prosecute, and maintain throughout the world (and otherwise control the conduct of any proceedings before any patent official or patent office with respect to) (i) the Medarex Patent Rights; (ii) [*] the Patent Rights relating to Antibodies, Antibody Materials, and Antibody Products invented, discovered, or developed by Medarex or any of its sublicensees resulting from the use of Collaboration Mice pursuant to this Agreement; (iii) the Patent Rights relating to Medarex's Production Process Technology; and (iv) registration of the Medarex Trademarks. In addition, Medarex shall have the sole right, but not the obligation, at its expense, to prepare, file, prosecute, and maintain (and otherwise control the conduct of any proceedings before any patent official or patent office with respect to) Patent Rights relating to any Improvements assigned by Kirin to Medarex pursuant to Section 12.1.3 hereof. (b) Certain Medarex Patent Rights. Notwithstanding the foregoing terms of Section 12.2.1(a), in the event that Medarex files a patent application that covers any Medarex Patent Rights and determines subsequent to making the filing that Medarex no longer desires to prosecute and/or maintain any such Medarex Patent Rights, Medarex shall promptly (which, in any event, shall be [*]) notify Kirin in writing of such decision and identify the Medarex Patent Rights at issue [*] If [*], Kirin shall provide written notice thereof to Medarex within [*] days after the receipt by Kirin of notice from Medarex pursuant to this Section 12.2.1(b). Upon receipt of timely notice from Kirin, Medarex shall [*]. Absent timely notice from Kirin, Medarex shall [*]. 12.2.2 Kirin Rights. (a) In General. As between the Parties, Kirin shall have the sole right, at its sole cost and expense, to prepare, file, prosecute, and maintain throughout the world (and otherwise control the conduct of any proceedings before any patent official or patent office with respect to) (i) the Kirin Patent Rights; (ii) subject to Section 12.2.5 hereof, the Patent Rights relating to Antibodies, Antibody Materials, and Antibody Products invented, discovered, or developed by Kirin or any of its sublicensees resulting from the use of Collaboration Mice pursuant to this Agreement; (iii) the Patent Rights relating to Kirin's Production Process Technology; and (iv) registration of the Kirin Trademarks. In addition, Kirin shall have the sole right, but not the obligation, at its expense, to prepare, file, prosecute, and maintain (and otherwise control the conduct of any proceedings before any patent official or patent office with respect to) Patent Rights relating to any Improvements assigned by Medarex to Kirin pursuant to Section 12.1.3 hereof. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -118-


 (b) Certain Kirin Patent Rights. Notwithstanding the foregoing terms of Section 12.2.2(a), in the event that Kirin files a patent application that covers any Kirin Patent Rights and determines subsequent to making the filing that Kirin no longer desires to prosecute and/or maintain any such Kirin Patent Rights, Kirin shall promptly (which, in any event, shall be [*] notify Medarex in writing of such decision and identify the Kirin Patent Rights at issue [*]. If [*], Medarex shall provide written notice thereof to Kirin within [*] days after the receipt by Medarex of notice from Kirin pursuant to this Section 12.2.2(b). Upon receipt of timely notice from Medarex, Kirin shall [*]. Absent timely notice from Medarex, Kirin shall [*]. 12.2.3 [*] Certain Medarex Patent Rights and Certain Kirin Patent Rights [*]. In the event that Medarex is [*] pursuant to Section 12.2.1(b) to [*] certain Medarex Patent Rights, or that Kirin is [*] pursuant to Section 12.2.2(b) to [*] certain Kirin Patent Rights, the Responsible Party shall [*] with respect to the [*] such Patent Rights. Such [*] includes, without limitation, (a) [*] the Non-Responsible Party [*] provision of a copy of any official correspondence received by such Party from a [*] with respect to such Patent Rights; and (b) providing the Non-Responsible Party a [*] on any [*] to a [*] at least [*] days prior to [*], unless such [*] allows [*] for the Responsible Party to [*], in which case the Party shall provide the other Party an [*] on any [*] to such [*] days prior to [*]. If the Non-Responsible Party fails to [*] days after receiving such [*], or, in the event [*], to provide comments within [*] days after receiving such [*], the [*]. If, however, the Non-Responsible Party [*] with respect to such [*], the Responsible Party agrees to [*], it being understood, however, that the Responsible Party shall have the right to [*]. At any time during the [*] any Patent Rights pursuant to this Section 12.2.3, the Non-Responsible Party may inform the Responsible Party that it [*] associated with such activities, in which case the Non-Responsible Party shall [*] the Responsible Party [*] after receipt of such notice and the Responsible Party shall have [*]. 12.2.4 KM Patent Rights and KM Trademarks. (a) In General. Subject to Section 12.2.5 hereof, the Parties shall have the following rights and obligations with respect to the preparation, filing, prosecution and maintenance of any and all KM Patent Rights and registrations of any and all KM Trademarks throughout the world. With respect to the preparation, filing, prosecution, and maintenance of such KM Patent Rights or registrations of KM Trademarks (and any proceedings relating thereto before any trademark or patent official or office) in any country or jurisdiction, the Party having the first right, but not the obligation, to conduct and control such activities shall be the Party in whose Primary Promotional Area the country or jurisdiction is located. If a Party elects not to prepare, file, prosecute and/or maintain any KM Patent Rights or registrations of KM Trademarks (or otherwise control the conduct of proceedings with respect thereto before any trademark or patent official or office) in a particular country within the Party's Primary Promotional Area, then such Party shall give the other Party written notice of such election [*] days before any right would be forfeited if no action was taken, and the other Party shall thereafter have the right, but not the obligation to prepare, file, prosecute and/or maintain such KM Patent Rights or registrations of KM Trademarks (or otherwise control the conduct of proceedings with respect thereto before any trademark or patent official or office). Medarex and Kirin shall assist and cooperate with one another in, and share equally the cost and expense of, preparing, filing, prosecuting, and maintaining the KM Patent Rights and registrations of KM Trademarks. Notwithstanding the foregoing, either Party may decline to pay its share of costs for preparing, filing, prosecuting, and maintaining any KM Patent Rights or registrations of KM Trademarks (or conducting other proceedings relating to such Patent Rights or Trademarks before any trademark or patent official or office) in a particular country or particular countries, in which case the declining Party shall assign, and shall cause its Affiliates to assign, if necessary, to the other Party all of its/their right, title, and interest in and to any such KM Patent Rights and KM Trademarks in the relevant country or countries, whereupon such KM Patent Rights and KM [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -119-


 Trademarks shall become part of Medarex's Patent Rights and Medarex Trademarks (in the case of an assignment by Kirin) or Kirin's Patent Rights and Kirin Trademarks (in the case of an assignment by Medarex) in such country or countries, as the case may be. (b) Cooperation. Each Party shall, subject to Section 12.2.5 hereof, cooperate fully in the other Party's preparation, filing, prosecution, and maintenance of the KM Patent Rights and registrations of KM Trademarks (and in any other proceedings before a trademark or patent official or office with respect thereto). Such cooperation includes, without limitation, (i) promptly executing all papers and instruments or requiring employees to execute such papers and instruments as reasonable and appropriate so as to enable such Party to prepare, file, prosecute, and maintain its KM Patent Rights and registrations of KM Trademarks in any country; and (ii) [*] the other Party [*] provision of a copy of any official correspondence received by such Party from a trademark or patent office in any country with respect to KM Patent Rights or KM Trademarks. In addition, with respect to any Patent Rights within KM Patent Rights, for so long as such patent remains jointly owned, the Party having prosecution responsibility therefor agrees to provide the other Party a [*] to [*] and [*] any [*] to a [*] at least [*] days [*] to [*], unless such [*] allows less than [*] days for the Party having prosecution responsibility to [*], in which case the Party shall provide the other Party an [*] and [*] any [*] to such [*] at least [*] days [*] to [*]. If the other Party fails to [*] days after receiving such [*], or, in the event the [*] allows less than [*] days for the Responsible Party to [*], to provide comments within [*] days after receiving sucsh [*], the [*]. If, however, the other Party [*] with respect to [*], the responsible Party agrees to [*], it being understood, however, that the responsible Party shall have the right, subject to Section 12.2.5 hereof, to [*]. 12.2.5 Use of Certain Mice and Certain Data in Connection with Patent Filings. Notwithstanding the rights conferred on each Party by Section 12.2.4 hereof with respect to the preparation, filing, prosecution, and maintenance of KM Patent Rights, on Kirin, pursuant to Section 12.2.2 hereof, with respect to Kirin's preparation, filing, prosecution, and maintenance of Kirin Patent Rights and on Medarex, pursuant to Section 12.2.1 hereof, with respect to Medarex's preparation, filing, prosecution, or maintenance of Medarex Patent Rights, (i) Medarex shall not, in any filing, correspondence or other submission to any patent official or patent office, (A) include [*], or (B) describe the [*] (other than in connection with claims that fall exclusively within the Excluded Claims), in each case without providing Kirin with an opportunity to [*] of any such filing, correspondence or other submission and [*], and (ii) Kirin shall not, in any filing, correspondence or other submission to any patent official or patent office, (A) include [*], or (B) describe the [*] (other than in connection with claims that fall exclusively within the Excluded Claims), in each case without providing Medarex with an opportunity to [*] of any such filing, correspondence or other submission and [*]. Notwithstanding the foregoing, in the event that data derived from the [*] for Kirin's [*] preparation, filing, prosecution, or maintenance of Kirin Patent Rights or KM Patent Rights, Medarex shall [*] to Kirin's use of such data, and in the event that data derived from [*] for Medarex's [*] preparation, filing, prosecution, or maintenance of Medarex Patent Rights or KM Patent Rights, Kirin shall [*] to Medarex's use of such data. 12.2.6 Patent Filings. Subject to Section 12.2.4 hereof and the last sentence of this Section 12.2.6, except as otherwise provided in this Section, Kirin covenants not to, and to cause its Affiliates not to, file any patent application (including, without limitation, a PCT application) describing or claiming Information and Inventions containing any Medarex Mice or KM-Mice or use thereof, without Medarex's prior written consent. Subject to Section 12.2.4 hereof and the last sentence in this Section 12.2.6, Medarex covenants not to, and to cause its Affiliates not to, file any patent application (including, without limitation, a PCT application) describing or claiming Information or Inventions containing any Kirin Mice or KM-Mice or use thereof, without Kirin's prior written consent. In addition, [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -120-


 except as otherwise provided in this Section, each Party agrees that [*], it will [*] include in its Project Agreements governing Partner Projects and/or In-House Projects, terms that require the Partner or In-House Collaborator, as the case may be, to refrain from filing any patent application describing or claiming Information or Inventions containing, in the case of a Partner or In-House Collaborator of Kirin, any Medarex Mice or KM-Mice, and in the case of a Partner or In-House Collaborator of Medarex, any Kirin Mice or KM-Mice. Notwithstanding the foregoing, [*] Party [*] for the filing by such Party or its Affiliate (and, subject to Section 8.6.1(b), neither Party has [*] Partners or In-House Collaborators to [*]) of a patent application on an Antibody, Antibody Product or Antibody Material, Production Process Development, Manufacturing technology or the use of any of the foregoing. 12.3 Enforcement of Patents. 12.3.1 Rights and Procedures. If either Party determines that any of the Patent Rights or Licensed Trademarks subject to this Agreement may be the subject of infringement by a Third Party, it shall [*] days after becoming aware of such infringement by a Third Party, notify the other Party in writing and [*]. (a) Medarex Technology, Medarex Trademarks, Kirin Technology and Kirin Trademarks. Medarex shall have the sole right, but not the obligation, [*] to attempt to abate such infringement, including by filing an infringement suit or taking other similar action, to the extent such infringement relates to Medarex Technology or Medarex Trademarks. Kirin shall have the sole right, but not the obligation, [*] to attempt to abate such infringement, including by filing an infringement suit or taking other similar action, to the extent such infringement relates to the Kirin Technology or Kirin Trademarks. If required by law in order for a Party to prosecute such an infringement suit pursuant to this Section 12.3.1(a), the licensee Party shall join such a suit as a party, and whether or not joined as a party shall provide such assistance [*] by the other Party in relation thereto, in each case at the [*]. Notwithstanding anything contained in this Section 12.3.1(a), it is understood and agreed that neither Party shall have any obligation to file an infringement suit or take other legal action against any Third Party based on claims of infringement of such Party's Patent Rights or Trademarks. (i) If the Party that Controls the Technology alleged to be infringed declines or otherwise fails to bring a patent infringement suit to abate any such alleged patent infringement in one or more countries where such alleged infringement is occurring, then the licensee Party shall have the right on a [*] basis to [*] any [*] that it is required to [*] pursuant to Section [*] hereof, and any [*] that it is required to [*] pursuant to Section [*] or [*] hereof, as applicable, in each case with respect to a Collaboration Product commercialized by the licensee Party (or its sublicensee), which Collaboration Product (A) was raised against and has a useful affinity for the same Antigen for which the Third Party's product has a useful affinity, and (B) is intended for an application (e.g., In Vivo Therapeutic Application, Ex Vivo Therapeutic Application, Diagnostic Application or use as a Regent) that is the same application for which the Third Party's product is intended, if in such country, and for so long as, all of the following conditions are satisfied (as demonstrated by [*]: (a) The licensee Party provides to the licensor Party a [*] (which [*]), concluding that there is a [*] for the [*] on the ground that a [*]; and (b) The Third Party's product shall [*]; and (c) To the extent that the licensee Party (or its sublicensee) [*], then the licensee Party (or its sublicensee) shall have [*], unless the licensee Party (or its sublicensee) has already [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -121-


 (ii) In addition to the rights provided to a licensee Party pursuant to Section 12.3.1(a)(i), with respect to any Collaboration Product(s) for which the licensee Party has satisfied the conditions provided in Sections 12.3.1(a)(i)(a), 12.3.1(a)(i)(b) and 12.3.1(a)(i)(c) hereof [*], for [*], if the Third Party's [*] product achieve [*]), the licensor Party shall [*] the licensee Party for each such [*] for such Collaboration Product(s), in the case of a Collaboration Product(s) resulting from an In-House Project, or (z) [*] for such Collaboration Product(s). For the avoidance of doubt, once any [*]. (iii) Notwithstanding anything contained in Sections 12.3.1(a)(i) or 12.3.1(a)(ii) hereof, neither Party shall [*] in connection with any Collaboration Product commercialized by such Party's Partner pursuant to a Project Agreement [*] to the [*] that such [*] to such Party or [*] of [*] such Party pursuant to the terms of the [*], as the case may be. (b) KM Patent Rights and KM Trademarks. In the case of any infringement by a Third Party that relates to the KM Patent Rights or KM Trademarks, the Responsible Party shall have the right, but not the obligation, [*] (unless a [*] is otherwise [*] the Parties), to attempt to abate such infringement by commercially appropriate steps, including filing an infringement suit or taking other similar action. In the event that the Responsible Party elects to not take any legal action with respect to such Third Party infringement, within [*] days following notice by one Party to the other Party of the claim of infringement, the Acting Party shall have the right but not the obligation, [*] (unless a [*] is otherwise [*] the Parties), to act to abate any such Third Party infringement, including, without limitation, by prosecuting an infringement suit or other legal proceeding. Notwithstanding the foregoing, each Party shall fully cooperate with the other Party in any action to abate infringement of the KM Patent Rights or KM Trademarks, and, if required by law in order for a Party to prosecute such suit, shall join such suit as a party. Notwithstanding anything to the contrary herein, each Party agrees that it shall [*] with respect to any KM Patent Rights or KM Trademarks for which it has responsibility [*], which [*]. 12.3.2 Costs and Expenses. Any amounts recovered by either Party pursuant to Section 12.3.1(a) hereof or 12.3.1(b) hereof, whether by settlement or judgment, shall be applied in the following order of priority: (a) to [*] each Party for its [*] and [*] (which amounts shall be allocated [*]); (b) to [*] each Party for any amounts that such Party is [*] in respect of such [*] pursuant to applicable [*] pursuant to which such [*] was [*] or other [*] and/or [*]; and (c) the remainder to be [*] who [*], except that in the case of any [*] by [*] or its [*], such amounts shall be allocated [*] based on the [*] as reflected in the terms and conditions of [*]. 12.4 Infringement of Third Party Rights. 12.4.1 Third Party Patent Licenses. (a) In General. Each Party shall have the right (but not the obligation) to negotiate and obtain from any Third Party any license or other rights that such Party deems appropriate, including a license under any Core Third Party Patent, in order to permit the full and unhindered use, subject to the terms and conditions of this Agreement, of any Collaboration Mice (and any Improvements thereto) and the practice of any of the Patent Rights licensed hereunder. Except as expressly provided in Section 12.4.1(b) hereof and the other terms and conditions of this Agreement, (i) each Party shall be [*] for the [*] to any [*] for [*], including any [*] to [*] that [*] by the [*], and/or the [*], and shall [*] to the other Party pursuant to this Agreement; and (ii) if the Party that obtains a license from a Third Party grants a sublicense to the other Party (and the other Party's sublicensees), such sublicense shall be subject to the [*], including through the use of any Collaboration Mice and/or the Exploitation of any Collaboration Antibodies or Collaboration Products. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -122-


 (b) Core Third Party Patents. If either Party becomes aware of any Core Third Party Patent during the term of this Agreement, or any pending patent application that would be a Core Third Party Patent if issued, such Party shall [*]. If a Party obtains from a Third Party a license under any Core Third Party Patent(s), at the time that the Party obtains the license, it shall [*] to [*] to the [*] (with the [*] to the [*]). If a Party obtains a [*] any [*] it shall [*]. The other Party shall [*]. (i) If a Party obtains a license from a Third Party under Core Third Party Patents in order to be able to use the other Party's mice, the KM-Mice (to the extent that the Core Third Party Patent would be infringed, in the absence of the license, as a result of any crossbreeding with the other Party's mice or the incorporation of the other Party's Technology in such KM-Mice) or to practice the other Party's Technology or the KM Patent Rights (to the extent that the Core Third Party Patent would be infringed, in the absence of the license, as a result of any crossbreeding with the other Party's mice or the incorporation of the other Party's Technology in the KM-Mice) without infringement, and in each case excluding any Third Party Patent Rights to the extent such Patent Rights [*], the Party obtaining the license shall have the right, on a [*] basis, to [*] of the [*] on [*] (whether in the form of [*], or as a [*]) to be [*] to the other Party under this Agreement on sales of such Collaboration Product in such country, subject to Section 12.4.1(b)(iii) hereof. If a Party claims the right to [*] pursuant to this Section 12.4.1(b)(i), it shall [*] to the [*], which [*] at issue and the [*] for its [*]. (ii) If a Party obtains a license from a Third Party under Core Third Party Patents in order to be able to use its own mice, the KM-Mice (to the extent that the Core Third Party Patent would be infringed, in the absence of the license, as a result of crossbreeding with the Party's own mice or the incorporation of the Party's own Technology in such KM-Mice) or to practice its own Technology or the KM Patent Rights (to the extent that the Core Third Party Patent would be infringed, in the absence of the license, as a result of crossbreeding with the Party's own mice or the incorporation of the Party's own Technology in the KM-Mice) without infringement, and in each case excluding any Third Party Patent Rights to the extent they claim [*], such Party shall [*] on account of such Party's [*] and such Party shall [*] to [*] against the [*] under this Agreement. If the Party obtaining the license [*], the Party that [*] shall be [*] to the [*] on account of [*] with respect to such [*]; provided, however, that such other Party shall have the right on a [*] basis, to [*] in connection with the [*] (whether in the form of [*], or as a [*]) to be paid by such other Party under this Agreement on sales of such Collaboration Product in such [*], subject to Section 12.4.1(b)(iii) hereof. (iii) Notwithstanding anything contained in Section 12.4.1(b)(i) or 12.4.1(b)(ii) hereof, [*] (whether as [*], or as a [*]) when [*] under this Agreement, regardless of the amount of any [*], shall be [*] in any [*]; provided, however, that [*] otherwise allowed under Section 12.4.1(b)(i) or 12.4.1(b)(ii) hereof [*] may be [*], subject to this Section 12.4.1(b)(iii). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -123-


 12.4.2 Third Party Litigation. (a) Infringement Claims Relating to Medarex Technology, Medarex Trademarks, Kirin Technology and/or Kirin Trademarks. Subject to Sections 12.4.2(b) and 12.4.2(d) hereof, in the event that a Third Party institutes a Third Party IP Infringement Suit relating to either Party's Technology or Licensed Trademarks, then the Party that is named as the defendant shall have [*] asserted against such Party, including the right to [*], except as set forth herein. The Party defending such suit shall [*]. The Party defending the Third Party IP Infringement Suit shall make [*] with respect to any Patent Rights or Know-How owned by the other Party or jointly owned by both Parties [*] with the other Party. If the Third Party IP Infringement Suit involves [*], in addition to the actions required above, the Party defending such claims shall (i) [*] to the other Party, (ii) provide [*] to the other Party of [*], and obtain from such other Party [*] to the extent that it [*], which [*], and (iii) [*], except in the context of a [*] pursuant to this Section 12.4.2(a), [*] or otherwise [*] without [*] and an [*]. (b) Infringement Claims Relating to Jointly-Owned Intellectual Property. The Parties shall have the right to jointly direct and control the defense of a Third Party IP Infringement Suit to the extent the claims involve jointly-owned intellectual property (i.e., KM Patent Rights, KM Know-How, or KM Trademarks). In the event that a Third Party institutes a Third Party IP Infringement Suit against a Party or any of its Affiliates that includes claims that involve jointly-owned intellectual property, and [*] but shall continue to provide to [*]. Regardless of whether such other Party [*], the Party defending such claims shall (i) [*] to the other Party, (ii) provide [*] to the other Party of [*], and obtain from such other Party [*] to the extent that it [*], which [*], and (iii) [*], except in the context of a [*] pursuant to this Section 12.4.2(b), [*] or otherwise [*] without [*] and an [*]. In any Third Party IP Infringement Suit that includes claims involving jointly-owned intellectual property, if the Parties are jointly directing and controlling the defense, the Parties shall each [*] with the defense of such claims; and if a non-named Party [*] pursuant to the preceding sentence of this Section 12.4.2(b), then such Party shall [*]. (c) Infringement Action Against a Party's Sublicensee. In the event that a Third Party brings an action against a Party's sublicensee alleging that the use of a Collaboration Mouse or the Exploitation of a Collaboration Antibody or Collaboration Product, or any other activities arising out of the exercise of license rights granted in this Agreement, infringes one or more trademarks, patents or other intellectual property rights held by such Third Party, then upon becoming aware of such action such Party shall promptly notify the other Party thereof in writing, and, if any claims asserted against the sublicensee relate to such other Party's Technology or Licensed Trademarks, or to any KM Patent Rights, KM Know How, or KM Trademarks, shall make [*] in the defense of claims. (d) Infringement Action Involving an Invalidity Claim. If a Third Party at any time asserts against a Party a claim that any of the Patent Rights relating to the Technology or the KM Patent Rights is invalid or otherwise unenforceable (an "Invalidity Claim"), whether as a defense to an infringement action brought against the Third Party pursuant to Section 12.3.1 hereof, or in an action brought against a Party(ies) by the Third Party, in addition to such Party's applicable obligations under Section 12.4.2(a) and 12.4.2(b) hereof, such Party shall [*], such Invalidity Claim to the extent that it relates to [*]. The Party responsible for responding to such claim shall be the Party against which such claim is asserted. [*] relating to the [*] or the [*] without the [*], which [*]. (e) Cooperation. In the event that a Third Party institutes a Third Party IP Infringement Suit against a Party or any of its Affiliates or any other Trademark, patent or other infringement suit against a Party's sublicensee (as more fully described in Section 12.4.2(c) hereof) [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -124-


 during the Term of this Agreement, any Party that is not controlling the defense shall, and shall [*], to [*] to [*] and [*] with the [*], and except as otherwise provided in Section 12.4.2(b) hereof, [*]. 12.4.3 Retained Rights. Nothing in this Section 12.4 shall prevent either Party, at its own expense, from obtaining any license or other rights from Third Parties it deems appropriate in order to permit the full and unhindered exercise of its rights under this Agreement. ARTICLE XIII CONFIDENTIALITY 13.1 Disclosure and Use Restrictions. Except as provided herein, the Parties agree that, during the Term and for [*] years after this Agreement's expiration or termination pursuant to Article XIV hereof, each Party (and its Affiliates) shall hold in strict confidence and shall not disclose to any Third Party (other than employees, Affiliates, legal counsel, consultants, auditors and advisors who, except in the case of legal counsel and auditors, are bound in writing by substantially similar confidentiality obligations) any Confidential Information of the other Party. During such period, a Party (and its Affiliates) shall not use Confidential Information of the other Party or its Affiliates or sublicensees for any purpose, except as expressly permitted herein. 13.2 Authorized Disclosure. 13.2.1 In General. A receiving Party may disclose Confidential Information to the extent that such disclosure is: (a) made in response to a valid subpoena or order of a court of competent jurisdiction or other supra-national, federal, national, regional, state, provincial, or local governmental or regulatory body of competent jurisdiction; (b) otherwise required by law, in the opinion of competent legal counsel having expertise in the relevant field(s) to the receiving Party, which shall be provided to the disclosing Party in the form of a written legal opinion at least ten (10) business days or within such shorter time as may be reasonable under the circumstances, but in any event prior to the receiving Party's disclosure of the Confidential Information pursuant to this Section 13.2.1(b); (c) made by the receiving Party to the regulatory authorities as required in connection with any filing, application or request for Regulatory Approval; provided, however, that reasonable measures shall be taken to assure confidential treatment of such information; or (d) made by the receiving Party to its financial institutions, banks and other advisors, or to such Party's consultants and advisors in connection with a proposed merger, acquisition, reorganization or financing; provided, however, that any such disclosure be made subject to a non-disclosure agreement with terms no less stringent than those provided in this Article XIII; and provided, however, that in the case of each of the exceptions set forth in Section 13.2.1 (a)-(c) hereof, the receiving Party shall first have given notice to the disclosing Party and given the disclosing Party a reasonable opportunity to use diligent efforts to limit disclosure and obtain confidential treatment or quash such order and to obtain a protective order requiring that the Confidential Information and documents that are the subject of such order be held in confidence by such court or agency or, if disclosed, be used only for the purposes for which the order was issued; and provided further that if a [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -125-


 disclosure order is not quashed or a protective order is not obtained, the Confidential Information disclosed in response to such court, governmental order, or governmental agency requirement shall be limited to that information which is legally required to be disclosed in response to such court, governmental agency, or governmental order. 13.2.2 With Consent. A receiving Party may disclose Confidential Information to the extent that the disclosing Party has provided its prior written consent to such disclosure. The Parties acknowledge and agree that in the course of developing and commercializing the technologies licensed under this Agreement, and in order for each Party to adequately advertise and promote the technologies pursuant to Section 6.3.1 hereof, certain disclosures of Confidential Information may be appropriate and each disclosing Party agrees [*] to any request by the receiving Party to disclose such Confidential Information as may be reasonable for such purposes. 13.2.3 Third Party [*]. A receiving Party may disclose Confidential Information to a Third Party with which it is [*] or [*] a [*] or other [*] relating to the [*], including, without limitation, a [*] governing a [*] and/or [*], to the extent that such disclosure relates [*] and provided that such Third Party has entered into a written non-disclosure/confidentiality agreement whereby such Third Party is bound by confidentiality and non-use obligations which are substantially similar to the ones to which the receiving Party is bound hereunder. With respect to all other Confidential Information, neither Party shall disclose any such Confidential Information to such Third Parties, except in accordance with Sections 13.2.1 and 13.2.2 hereof. 13.3 Use of Name. Each Party (and its Affiliates) may use the name of the other Party (or an abbreviation or adaptation thereof) (a) in connection with announcements and other permitted disclosures relating to this Agreement and the activities contemplated hereby; (b) as required by applicable law; (c) as reasonably necessary for the exercise of rights granted to such Party pursuant to Section 6.3.1 hereof; and (d) otherwise as agreed in writing by such other Party. 13.4 Press Releases and Filings with the SEC. Neither Party (or its Affiliates) shall issue a press release nor make any other public disclosure of the terms of this Agreement without the prior approval of such press release or public disclosure by the other Party hereto. Each Party shall submit any such press release or public disclosure to the other Party, and such other Party shall have [*] business days to review and approve any such press release or public disclosure, which approval shall not be unreasonably withheld. If such other Party does not respond within such [*] business day period, the press release or public disclosure shall be deemed approved. If a Party obtains the approval of the other Party to make a public disclosure pursuant to this Section 13.4 in connection with a filing with or other submission to the SEC or other regulatory authority, or if public disclosure is otherwise deemed approved pursuant to the preceding sentence of this Section 13.4, the Party that has obtained (or is deemed to have obtained) approval to make a disclosure (and such Party's Affiliates) shall be permitted to make subsequent public disclosures to the SEC or other regulatory authorities containing statements that are substantially similar to the statements contained in such previously permitted disclosures, without seeking the prior approval of the other Party with respect to such subsequent disclosures. In addition and notwithstanding the foregoing, if a public disclosure of the terms of this Agreement is required by law, as reasonably determined by counsel to the Party seeking to make a disclosure, including without limitation in a filing with or other submission to the SEC, to be made within a period of less than [*] business days from the date such Party becomes subject to such legal disclosure requirement, and (a) such Party has provided copies of the disclosure to the other Party as far in advance of such filing or other disclosure as is reasonably practicable under the circumstances, (b) such Party has promptly notified the other Party in writing of such requirement and any respective timing constraints, and (c) such Party has given the other Party a reasonable time under the circumstances from the date of notice by such Party of the required [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -126-


 disclosure to [*], request confidential treatment or approve such disclosure, then such Party shall have the right to make such public disclosure at the time and in the manner reasonably determined by its counsel to be required by law or governmental regulation. Notwithstanding anything to the contrary herein, it is hereby understood and agreed that if in each case set forth in this Section 13.4, the other Party [*] within the respective time periods or constraints specified herein or within the respective notice, the Party seeking to make such disclosure or its counsel, as the case may be, shall [*] (i) [*] and (ii) [*] to [*] and/or obtain [*] to the extent [*]. 13.5 Equitable Relief. Each Party acknowledges and agrees that breach of any of the terms of this Article XIII would cause irreparable harm and damage to the other and that such damage may not be ascertainable in money damages and that as a result thereof the non-breaching Party would be entitled to seek from a court as is contemplated by Section 17.2 hereof equitable or injunctive relief restraining any breach or future violation of the terms contained herein by the breaching Party without the necessity of proving actual damages. Such right to equitable relief is in addition to whatever remedies either Party may be entitled to as a matter of law or equity, including money damages, which other remedies are subject to the provisions of this Agreement concerning the resolution of Disputes. 13.6 Third Party Agreements. Each Project Agreement entered into after the Effective Date by a Party and its Affiliate, Partner, or In-House Collaborator (or potential Partner or In-House Collaborator) involving the use of Collaboration Mice to research, develop, and/or commercialize Collaboration Products shall include terms and conditions governing use and disclosure of Confidential Information that are consistent in all material respects with the definition of Confidential Information and the terms and conditions set forth in Sections 13.1-13.4 hereof. ARTICLE XIV TERM AND TERMINATION 14.1 Term. This Agreement shall take effect upon the Effective Date and shall continue in effect until December 31, 2014, unless terminated at an earlier date in accordance with the terms and conditions set forth in this Article XIV. 14.2 Termination of this Agreement for Material Breach. In the event of a material breach by a Party of any of its representations, warranties, covenants or other obligations under this Agreement, the non-breaching Party may deliver to the breaching party a notice specifying the nature of the alleged breach, and the breaching Party shall cure such breach within the Cure Period. If such notice is delivered to the breaching Party and the material breach is not cured during the Cure Period or, if such breach cannot be cured within such period, the Party in breach does not commence actions to cure such breach within the Cure Period and thereafter diligently continue such actions until cured, the non-breaching Party shall be entitled, without prejudice to any of its other rights and benefits conferred on it by this Agreement, and in addition to any other remedies available to it by law or in equity, to terminate this Agreement in its entirety. If the Party alleged to be in breach disputes the alleged breach, it may exercise its right to invoke the dispute resolution procedures set forth in Article XVII hereof. For purposes of clarification, the Parties hereby acknowledge and agree that if [*] because a [*] exists in its favor, such failure to perform shall [*] by such Party if a [*] pursuant to Section 8.11.4 hereof. 14.3 Consequences of Expiration or Termination. 14.3.1 Expiration. Except as provided in Sections 10.9.1 and 10.9.2 hereof, upon expiration of the full Term of this Agreement in accordance with Section 14.1 (i.e., December 31, 2014) [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -127-


 hereof (but not upon any earlier termination of this Agreement), the licenses granted by a Party to the other Party hereunder shall be deemed [*], and the licenses under Kirin Technology to Medarex, under the Medarex Technology to Kirin, and under the KM-Mice, KM Patent Rights, and KM Know-How from one Party to the other Party shall [*]. Following expiration of this Agreement, any license subject to [*] hereof shall become [*]. 14.3.2 Effect of Expiration or Termination on Sublicenses. Upon expiration or termination of this Agreement pursuant to this Article XIV, any sublicenses or other rights (including options) granted by a Party to a Third Party pursuant to an agreement in effect at such expiration or termination date with outstanding payment, performance, or other obligations shall, [*]; provided, however, that (a) such agreement was properly entered into consistent with the terms and conditions of this Agreement and the sublicense was properly granted; (b) the sublicensee is not then in breach of the agreement containing the terms and conditions of the sublicense (or any Direct Sublicense Agreement); and (c) all the restrictions and limitations of this Agreement apply to the sublicensee under such agreement (and any Direct Sublicense Agreement) as though this Agreement continued in effect. 14.3.3 Termination Pursuant to Section 14.2. (a) Destruction of Mice, Mice Materials and Antibodies. Within a reasonable time after termination of this Agreement in its entirety by either Party pursuant to Section 14.2 hereof, each Party, at the request of the other Party, shall destroy, in the case of Medarex as the destroying Party, all Kirin Mice, Mice Materials derived therefrom and Antibodies and Antibody Products obtained through the use of such mice, that are in Medarex's possession as of the date of termination, and in the case of Kirin as the destroying Party, all Medarex Mice, Mice Materials derived therefrom, and Antibodies and Antibody Products obtained through the use of such mice, that are in Kirin's possession as of the date of termination. Promptly following such destruction, an agent of the destroying Party shall provide the other Party with written certification thereof. (b) No Liability. Neither Party shall incur any liability whatsoever for any damage, loss or expenses of any kind suffered or incurred by the other arising from or incident to any lawful termination of this Agreement (or any part thereof) by such Party which complies with the terms of the Agreement whether or not such Party is aware of any such damage, loss or expenses. 14.4 Cure in Certain Instances. Notwithstanding anything else contained in this Agreement, in the event that Medarex grants to Kirin a license (or a sublicense) in Section 8.2 hereof or Medarex grants to a Kirin Affiliate, Kirin Partner or Kirin In-House Collaborator a license (and/or a sublicense) in a Direct Sublicense Agreement, which license (and/or sublicense) is [*] under the Technology and/or Medarex's interest in the KM Patent Rights and/or KM Know-How with respect to one or more antibody(ies) pursuant to an agreement [*], then for purposes of Sections 8.11 and 14.2 hereof, the exercise by Medarex of [*] to [*] for Kirin the [*] in the [*] under the [*] and [*] in the [*] and/or [*] in accordance with Section [*] hereof with respect to the [*] in the [*] shall be [*] of an [*] under this Agreement with respect thereto, [*], provided, however, that this Section 14.4 shall not be construed to apply to any other breach of Medarex's obligations hereunder, including, without limitation, breach by Medarex of its obligations to (a) follow the procedures set forth in Section 2.3 hereof with respect to (i) the listing of Antigens on any Antigen Lists that Medarex has an obligation to maintain pursuant to Section 2.1.1 hereof, or (ii) the listing of Antibodies on the Antibody Sequence List; or (b) respond to (i) Antigen Availability Inquiries pursuant to Section 3.3 hereof, or (ii) Antibody Availability Inquiries [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -128-


 pursuant to Section 3.5 hereof. For purposes of Section 8.2.7(e) hereof and this Section 14.4, [*] shall be tested as compared to the [*] that is [*], in the [*], nor a [*]. 14.5 Rights in Bankruptcy. 14.5.1 Licenses of "Intellectual Property." The Parties acknowledge and agree that all rights and licenses granted under or pursuant to this Agreement by Medarex or Kirin are, and shall otherwise be deemed to be, licenses of rights to "intellectual property" for purposes of the Bankruptcy Code, including without limitation Section 101 thereof. The Parties agree that the Parties, as licensees of such rights under this Agreement, may retain and may fully exercise all of their rights and elections under the Bankruptcy Code (including, without limitation, under Section 365(n) of the Bankruptcy Code) and any rights and elections provided to licensees under the Japanese bankruptcy law or other Japanese laws applicable to bankruptcies or insolvencies. Without limitation of the foregoing, the Parties agree that, to the maximum extent permitted by applicable law, in any bankruptcy proceeding commenced by or against a Party under Japanese law, the non-debtor Party shall retain the licenses and other rights granted to it in Article VIII hereof and may continue to exercise such rights in accordance with the terms and conditions of this Agreement, irrespective of whether the debtor Party elects to rescind this Agreement pursuant to Article 59 of the Japanese bankruptcy law (or any comparable provision of other Japanese laws applicable to bankruptcies or insolvencies). 14.5.2 Embodiments of Intellectual Property. The non-debtor, licensee Party shall have rights to embodiments of the intellectual property of the debtor Party that is licensed to the non-debtor Party under this Agreement ("Embodiments of Intellectual Property"), as those rights are set forth in Section 365(n) of the Bankruptcy Code (or any analogous provision of Japanese law enacted from time to time, in the case of a bankruptcy or rehabilitation proceeding in Japan). 14.5.3 Supplementary Agreements. The Parties acknowledge and agree that each of the [*] Agreement and the [*] Agreement is and shall be deemed to be an "agreement supplementary to" this Agreement, as that phrase is used in Section 365(n) of the Bankruptcy Code. 14.5.4 Effect of Bankruptcy Filing. In the event that one Party becomes a debtor in a case under the Bankruptcy Code (or becomes the subject of a comparable proceeding under Japanese bankruptcy law or other Japanese laws applicable to bankruptcies or insolvencies), then unless or until this Agreement is rejected or deemed rejected pursuant to Section 365(n) of the Bankruptcy Code (or, alternatively, unless or until this Agreement is rescinded pursuant to Article 59 of the Japanese bankruptcy law or any comparable provision of other Japanese laws applicable to bankruptcies or insolvencies), debtor Party, or its trustee (or similar representative under Japanese law) shall, upon the written request of the non-debtor Party, (a) either (i) perform this Agreement, or (ii) provide to the non-debtor Party a complete and accurate duplicate of (or complete access to) all Embodiments of Intellectual Property not in the non-debtor Party's possession upon the commencement of any such bankruptcy proceeding (or comparable Japanese proceeding), to the full extent required by Section 365(n)(4) of the Bankruptcy Code or any analogous provision of Japanese law; and (b) not interfere with the rights of the non-debtor Party as licensee or any of its permitted sublicensees under this Agreement or any agreement supplementary to this Agreement, to all intellectual property of the debtor Party licensed to non-debtor Party under this Agreement. 14.5.5 Consequences of Rejection. In the event that one Party becomes a debtor in a case under the Bankruptcy Code (or becomes the subject of a comparable proceeding under Japanese bankruptcy law or other Japanese laws applicable to bankruptcies or insolvencies) and such Party in its capacity as a debtor in possession or through its trustee or in any other capacity or through any other [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -129-


 successor rejects this Agreement pursuant to Section 365 of the Bankruptcy Code (or rescinds this Agreement pursuant to Article 59 of the Japanese bankruptcy law or any comparable provision of other Japanese laws applicable to bankruptcies or insolvencies), or in the event this Agreement is deemed rejected under the Bankruptcy Code (or deemed rescinded under any such Japanese law) because it is not capable of assumption and assignment under the Bankruptcy Code (or of ratification under any such Japanese law), other than as a result of the failure or refusal of the non-debtor Party to consent to the assumption (or ratification) of this Agreement, then: (a) the non-debtor Party in its capacity as a licensee of the other Party's intellectual property, may: (i) treat this Agreement as terminated; or (ii) retain its rights hereunder and under the [*] Agreement (including the right to enforce the exclusivity provisions of the licenses granted in this Agreement) to the full extent permitted by Section 365(n) of the Bankruptcy Code (or any analogous provision of Japanese law enacted from time to time, as applicable); and (b) if the non-debtor Party elects to retain its rights pursuant to Section 14.5.5(a)(ii) hereof, the non-debtor Party shall be deemed to have requested of the debtor Party as debtor in possession (or of its trustee (or similar representative under Japanese law), if any) that the same (i) immediately provide and deliver to the non-debtor Party, all intellectual property of the debtor Party licensed to the non-debtor Party under this Agreement and all Embodiments of the Intellectual Property without further notice or seeking relief from the automatic stay or other leave from any court, if not previously delivered to the non-debtor Party; and (ii) not interfere with the rights of the non-debtor Party as licensee or any of its permitted sublicensees under this Agreement or any agreement supplementary to this Agreement, to such intellectual property. 14.6 Accrued Rights; Surviving Obligations. 14.6.1 Accrued Rights. Termination or expiration of this Agreement for any reason shall be without prejudice to any rights that shall have accrued to the benefit of a Party prior to such termination or expiration. No provision under this Article XIV shall be interpreted to limit any rights to any other remedies a Party may have at law or in equity. Such termination or expiration shall not relieve a Party from obligations that are expressly indicated to survive the termination or expiration of this Agreement. 14.6.2 Survival. Articles XII, XIII, XV, XVII and XVIII, and Sections 2.6, 8.6.1(b), 8.6.2, 8.6.3, 8.7, 10.9.1, 10.9.2, 10.12, 14.3, 14.5, and 16.5 and this Section 14.6 of this Agreement shall survive expiration or termination of this Agreement for any reason. 14.7 Notices Relating to Project Agreements for Kirin Partner Projects and Kirin In-House Projects. The Parties acknowledge and agree that, by virtue of the fact that Medarex will enter into Direct Sublicense Agreements with Kirin's Partners and In-House Collaborators, which Direct Sublicense Agreements shall contain cross-default provisions that permit Medarex to terminate such Direct Sublicense Agreements in the event of defaults by such Partners or In-House Collaborators under agreements entered into with Kirin if such defaults adversely affect Medarex, Medarex has an interest in being kept informed by Kirin of any such default. Kirin shall provide prompt written notice to Medarex of any such default by a Kirin Partner or Kirin In-House Collaborator, setting forth the nature of the [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -130-


 default and the date on which the cure period expires, and thereafter shall provide prompt subsequent written notice to Medarex indicating whether such default was timely cured. ARTICLE XV INDEMNITY 15.1 Indemnification of Medarex. Kirin shall indemnify Medarex, its Affiliates, and solely in such capacities, its directors, officers, employees, and agents and defend and save each of them harmless, from and against any and all Losses arising from or occurring as a result of (a) the breach by Kirin of this Agreement, (b) the breach by Kirin of any of the Kirin In-License Agreements, if any, (c) the gross negligence or willful misconduct on the part of Kirin in performing Kirin's obligations under this Agreement, or (d) any activities of Kirin, its Affiliates, Partners or In-House Collaborators relating to any Collaboration Mice or the Exploitation of any Collaboration Antibodies or Collaboration Products, except (i) to the extent such Losses arise from [*] of [*] of [*] directly [*] of the [*] of (1) [*], (2) the [*] (to the extent that such [*] the incorporation of [*]), or (3) the [*] described in clause (i)(1) or (i)(2) of this Section 15.1 and/or [*], and (ii) for those Losses for which Medarex has an obligation to indemnify Kirin pursuant to Section 15.2.1 hereof, as to which Losses under clause (ii) of this Section each Party shall indemnify the other to the extent of their respective liability for the Losses, provided, however, that Kirin shall not be obligated to indemnify for Losses that arise as a result of gross negligence or willful misconduct on the part of Medarex or any of its Affiliates, Partners or In-House Collaborators. 15.2 Indemnification of Kirin. 15.2.1 Subject to Section 15.2.2 hereof, Medarex shall indemnify Kirin, its Affiliates, and solely in such capacities, its directors, officers, employees, agents and defend and save each of them harmless, from and against any and all Losses arising from or occurring as a result of (a) the breach by Medarex of this Agreement, (b) the breach by Medarex of any of the Medarex In-License Agreements, (c) the gross negligence or willful misconduct on the part of Medarex in performing Medarex's obligations under this Agreement, or (d) any activities of Medarex, its Affiliates, Partners or In-House Collaborators relating to any Collaboration Mice or the Exploitation of any Collaboration Antibodies or Collaboration Products, except (i) to the extent such Losses arise from [*] of [*] of [*] directly [*] of the [*] of (1) [*], (2) the [*] (to the extent that such [*] the incorporation of [*]), or (3) the [*] described in clause (i)(1) or (i)(2) of this Section 15.2.1 and/or [*], and (ii) for those Losses for which Kirin has an obligation to indemnify Medarex pursuant to Section 15.1 hereof, as to which Losses under clause (ii) of this Section each Party shall indemnify the other to the extent of their respective liability for the Losses, provided, however, that Medarex shall not be obligated to indemnify for Losses that arise as a result of gross negligence or willful misconduct on the part of Kirin or any of its Affiliates, Partners or In-House Collaborators. 15.2.2 Notwithstanding anything contained in Section 15.2.1 hereof, or the other terms and conditions of this Agreement, Medarex shall not be required to indemnify Kirin or any of its Affiliates, Partners, In-House Collaborators, directors, officers, employees or agents, or defend and save any of them harmless, from and against any Losses arising from or occurring as a result of Medarex's granting to Kirin a license (and/or a sublicense) in Section 8.2 hereof or Medarex granting to a Kirin Affiliate, Kirin Partner or Kirin In-House Collaborator a license (and/or a sublicense) in a Direct Sublicense Agreement, which license (and/or sublicense) is [*] under the Technology and/or the KM Patent Rights and/or KM Know-How with respect to one or more antibody(ies) pursuant to an agreement [*]; provided, however, that this Section 15.2.2 shall not apply to the extent that the above-described Losses arise from or occur as a result of any breach by Medarex from and after the Effective Date of its [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -131-


 obligations to (a) follow the procedures set forth in Section 2.3 hereof with respect to (i) the listing of Antigens on any Antigen Lists that Medarex has an obligation to maintain pursuant to Section 2.1.1 hereof, or (ii) the listing of Antibodies on the Antibody Sequence List; or (b) respond to (i) Antigen Availability Inquiries pursuant to Section 3.3 hereof, or (ii) Antibody Availability Inquiries pursuant to Section 3.5 hereof. 15.3 Indemnification Procedure. 15.3.1 Notice of Claim. When requesting indemnification under Section 15.1 or Section 15.2.1 hereof, the Indemnified Party shall promptly give the Indemnifying Party an Indemnification Claim Notice, but in no event shall the Indemnifying Party be liable for any Losses that result from any delay in providing such notice. The Indemnified Party shall furnish promptly to the Indemnifying Party copies of all papers and official documents received in respect of any Losses. All indemnification claims in respect of an Indemnified Party, or their respective directors, officers, employees, and agents shall be made solely by such Indemnified Party. 15.3.2 Third Party Claims. The obligations of an Indemnifying Party under this Article XV with respect to Losses arising from Third Party Claims shall be governed by and be contingent upon the following additional terms and conditions: (a) Control of Defense. At its option, the Indemnifying Party may assume the defense of any Third Party Claim by giving notice to the Indemnified Party within [*] days after the Indemnifying Party's receipt of an Indemnification Claim Notice. The assumption of the defense of a Third Party Claim by the Indemnifying Party shall not be construed as an acknowledgment that the Indemnifying Party is liable to indemnify any Indemnified Party in respect of the Third Party Claim, nor shall it constitute a waiver by the Indemnifying Party of any defenses it may assert against any Indemnified Party's claim for indemnification. Upon assuming the defense of a Third Party Claim, the Indemnifying Party may appoint as lead counsel in the defense of the Third Party Claim any legal counsel selected by the Indemnifying Party and, in the event of a conflict of interest between the Indemnifying and Indemnified Parties with respect to such Third Party Claim, the Indemnified Party shall have the right to appoint its own single counsel, acceptable to and at the expense of the Indemnifying Party, to participate in the resolution of such Third Party Claim; provided, however, that the Indemnified Party shall only be permitted to retain separate counsel pursuant to this Section 15.3.2(a) if, upon request of the Indemnifying Party, it first delivers to the Indemnifying Party a legal opinion prepared by counsel acceptable to the Indemnifying Party, which counsel shall not be affiliated or have been previously retained by the Indemnified Party or any of its Affiliates, concluding that there is a conflict of interest between the Parties sufficient to warrant the retention of separate counsel. In the event the Indemnifying Party assumes the defense of a Third Party Claim, the Indemnified Party shall immediately deliver to the Indemnifying Party all original notices and documents (including court papers) received by any Indemnified Party in connection with the Third Party Claim. Should the Indemnifying Party assume the defense of a Third Party Claim and thereafter determine it is not obligated to provide indemnification hereunder, it shall promptly so notify the Indemnified Party. Any such notice shall include a well-reasoned statement explaining why indemnification in respect of such Third Party Claim is not required hereunder. After providing such notice the Indemnifying Party shall not be liable to the Indemnified Party or any other Indemnified Party for any legal expenses subsequently incurred by such Indemnified Party in connection with the analysis, defense, or settlement of the Third Party Claim, unless it is later determined that indemnification in respect of such Third Party Claim was indeed required. In the event that it is ultimately determined that the Indemnifying Party is not obligated to indemnify, defend, or hold harmless an Indemnified Party from and against the Third Party Claim, the Indemnified Party shall reimburse the Indemnifying Party for any and all costs and expenses (including reasonable attorneys' fees [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -132-


 and costs of suit) and any Losses incurred by the Indemnifying Party in its defense of the Third Party Claim with respect to such Indemnified Party. If, however, it is ultimately determined that the Indemnifying Party was obligated to provide indemnification hereunder, the Indemnifying Party shall be responsible for prompt payment of any and all costs and expenses (including reasonable attorneys' fees and costs of suit) and any Losses incurred by the Indemnified Party in its defense of the Third Party Claim. (b) Right to Participate in Defense. Without limiting Section 15.3.2(a) hereof, any Indemnified Party shall be entitled to participate in, but not control, the defense of such Third Party Claim and to employ counsel of its choice for such purpose; provided, however, that such employment shall be at the Indemnified Party's own expense unless (i) the employment thereof has been specifically authorized by the Indemnifying Party in writing, or (ii) the Indemnifying Party has failed to assume the defense and employ counsel in accordance with Section 15.3.2(a) hereof (in which case the Indemnified Party shall control the defense). (c) Settlement. With respect to any Third Party Claims where the Indemnifying Party has assumed the defense thereof in accordance with Section 15.3.2(a) hereof, the Indemnifying Party shall have the sole authority to consent to the entry of any judgment, enter into any settlement, or otherwise dispose of such Loss, provided it obtains the prior written consent of the Indemnified Party (which consent shall not be unreasonably withheld). The Indemnifying Party shall not be liable for any settlement or other disposition of a Loss by an Indemnified Party that is reached without the written consent of the Indemnifying Party. Regardless of whether the Indemnifying Party chooses to defend or prosecute any Third Party Claim, no Indemnified Party shall admit any liability with respect to, or settle, compromise or discharge, any Third Party Claim without the prior written consent of the Indemnifying Party. (d) Cooperation. In the event that the Indemnifying Party assumes the defense or prosecution of a Third Party Claim, the Indemnified Party shall, and shall cause each other Indemnified Party to, cooperate in the defense or prosecution thereof and shall furnish such records, information and testimony, provide such witnesses and attend such conferences, discovery proceedings, hearings, trials and appeals as may be reasonably requested in connection therewith. Such cooperation shall include access during normal business hours afforded to the Indemnifying Party to, and reasonable retention by the Indemnified Party of, records and information that are reasonably relevant to such Third Party Claim, and making Indemnified Parties and other employees and agents available on a mutually convenient basis to provide additional information and explanation of any material provided hereunder, and the Indemnifying Party shall reimburse the Indemnified Party for all its reasonable out-of-pocket expenses in connection therewith. (e) Expenses. Except as provided above, the costs and expenses, including reasonable fees and disbursements of counsel, incurred by the Indemnified Party in connection with any claim shall be reimbursed on a Calendar Quarter basis by the Indemnifying Party, without prejudice to the Indemnifying Party's right to contest the Indemnified Party's right to indemnification and subject to refund in the event the Indemnifying Party is ultimately held not to be obligated to indemnify the Indemnified Party. 15.4 Insurance. Each Party shall have and maintain (a) commercial general liability insurance (in each country, as is customary on a country-by-country basis) at all times during the Term, solely in the territories in which it has or maintains substantial operations, which, for the avoidance of doubt, [*] for the purposes of [*], and [*] for the purposes of [*], and (b) [*] (or with respect to [*]) commencing no later than the [*] by such Party for [*], in the [*], in such [*] as such Party [*] and as is [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -133-


 [*]. Maintenance of such insurance coverage shall not relieve either Party of any responsibility under this Agreement for damages in excess of insurance coverage limits or otherwise. ARTICLE XVI REPRESENTATIONS AND WARRANTIES 16.1 Representations, Warranties and Covenants. Each Party hereby represents and warrants to the other Party as of the Effective Date and further covenants to the other Party, as follows: 16.1.1 Such Party (a) has the power and authority and the legal right to enter into this Agreement, perform its obligations hereunder, and, subject to the terms and conditions set forth herein, grant the rights, licenses, sublicenses and further sublicenses provided for herein, and (b) has taken all necessary action on its part required to authorize the execution and delivery of this Agreement and the performance of its obligations hereunder. This Agreement has been duly executed and delivered on behalf of such Party and constitutes a legal, valid and binding obligation of such Party and is enforceable against it in accordance with its terms subject to the effects of bankruptcy, insolvency or other laws of general application affecting the enforcement of creditor rights and judicial principles affecting the availability of specific performance and general principles of equity, whether enforceability is considered a proceeding at law or equity. 16.1.2 There is no pending litigation in which such Party or any of its Affiliates is named as a party and has been served with process and, to the knowledge of the officers of such Party, there is no threatened litigation against such Party or any of its Affiliates (and such Party has not received any communication) that alleges that such Party's activities related to this Agreement have violated, or that by conducting the activities as contemplated herein such Party would violate, any of the intellectual property rights of any other Person. 16.1.3 Except in relation to the Parties' Hart-Scott-Rodino filings, as provided in Section 8.9 hereof, all necessary consents, approvals and authorizations of all regulatory and governmental authorities and other Persons required to be obtained by such Party in connection with the execution and delivery of this Agreement and the performance of its obligations hereunder have been obtained. 16.1.4 The execution and delivery of this Agreement and the performance of such Party's obligations hereunder (a) do not conflict with or violate any requirement of applicable law or regulation or any provision of the articles of incorporation, bylaws, limited partnership agreement or any similar instrument of such Party, as applicable, in any material way, and (b) [*] do not in any material way conflict with, violate, or breach or constitute a default or require any consent under, any contractual obligation or court or administrative order by which such Party is bound. 16.1.5 At no time shall such Party or its Affiliates, directly or indirectly, expressly or by implication, by action or omission or otherwise (a) assign, transfer, convey or otherwise encumber any right, title or interest in or to its Patent Rights or Know-How, (b) grant any license or other right, title or interest in or to its Patent Rights or Know-How, or (c) agree to or otherwise become bound by any covenant not to sue for any infringement, misuse or other action or inaction with respect to its Patent Rights or Know-How, in each case that is inconsistent with the grants, assignments, and other rights reserved to the other Party under this Agreement. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -134-


 16.1.6 Each Party has or shall obtain from its employees and agents, and from each of its Affiliates and such Affiliates' employees and agents, all rights to Information and Inventions that relate to the Technology and KM Patent Rights, such that each Party shall receive from the other Party the licenses and other rights granted to such Party hereunder, without payment obligations, except those set forth in Article X. 16.1.7 Each Party has or shall obtain from its Affiliates all rights to Technology and to the KM Patent Rights necessary in order to meet its obligations hereunder. 16.1.8 Each Party shall cause its respective Affiliates to take any and all actions required by the terms of this Agreement to be taken by such Affiliates, and to refrain from taking any and all actions which such Affiliates are prohibited from taking by the terms of this Agreement. 16.1.9 Each Party shall comply with applicable law in exercising any of the licenses or other rights granted to such Party by the other Party in this Agreement. 16.2 Additional Representations, Warranties and Covenants of Medarex. Medarex represents and warrants to Kirin as of the Effective Date and further covenants to Kirin that: 16.2.1 Medarex, Inc. is a corporation duly organized, validly existing and in good standing under the laws of the State of New Jersey and GenPharm International, Inc. is a corporation duly organized, validly existing and in good standing under the laws of the State of California. Each of Medarex, Inc. and GenPharm International, Inc. has full corporate power and authority and the legal right to own and operate its property and assets and to carry on its business as it is now being conducted and as it is contemplated to be conducted by this Agreement. 16.2.2 Exhibit C contains a true, correct and complete list of all of the agreements entered into between Medarex and a Third Party entered into prior to December 27, 1999, pursuant to which Medarex (a) has received a license from such Third Party with respect to Patent Rights that qualify as "Medarex Patent Rights" for purposes of this Agreement, and (b) Medarex is permitted to grant sublicense rights to Kirin with respect to at least some of the rights granted to Medarex in such agreements. Medarex has provided to Kirin true, correct and complete copies of the Medarex In-License Agreements [*], which agreement [*] hereby [*] provided in Section [*] hereof), to the extent that Medarex has reasonably determined that it is permitted by the terms of each such agreement to provide such copies to Kirin. As of the Effective Date, Medarex is [*] During the Term of this Agreement, Medarex shall [*] and it shall [*], without [*], take [*] any such [*] if such [*] would [*] under this Agreement or otherwise [*]. If at any time during the Term of this Agreement it is determined that any agreement entered into by Medarex and a Third Party should have been but was not included on Exhibit C as of the Effective Date, the Parties shall amend Exhibit C to include such agreement. 16.2.3 During the period beginning on December 27, 1999, and ending on the Effective Date, Medarex has [*] the [*] to [*] any Antibody or Antibody Product, or [*] to [*] to [*] any Antibody or Antibody Product, except to the extent such [*] was (a) [*] the Agreement on Essential Terms for Collaboration, or (b) [*] and [*] the writing exchanged by the Parties pursuant to Section 8.8.1 hereof. During the Term of this Agreement, Medarex shall [*] to [*] any Antibody or Antibody Product, or [*] to [*] any Antibody or Antibody Product, except to the extent such [*]. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -135-


 16.3 Additional Representations, Warranties and Covenants of Kirin. Kirin represents and warrants to Medarex as of the Effective Date and further covenants to Medarex that: 16.3.1 Kirin is a corporation duly organized, validly existing and in good standing under the laws of Japan, and has full corporate power and authority and the legal right to own and operate its property and assets and to carry on its business as it is now being conducted and as it is contemplated to be conducted by this Agreement. 16.3.2 As reflected in Exhibit D attached hereto, Kirin has not entered into [*], pursuant to which Kirin (a) has received a license from such Third Party with respect to Patent Rights that qualify as "Kirin Patent Rights" for purposes of this Agreement, and (ii) is permitted to grant sublicense rights with respect to at least some of the rights granted to Kirin in such agreements. If at any time during the Term of this Agreement it is determined that any agreement entered into by Kirin and a Third Party should have been but was not included on Exhibit D, the Parties shall amend Exhibit D to include such agreement. With respect to any such agreement added to Exhibit D, if any, Kirin shall provide to Medarex a true, complete and correct copy of such Kirin In-License Agreement to the extent that Kirin has determined, [*] During the Term of this Agreement, Kirin shall [*], if any, and it shall [*] take [*] if such [*] would [*] under this Agreement or otherwise [*]. 16.3.3 During the period beginning on December 27, 1999, and ending on the Effective Date, Kirin has [*] the [*] to [*] any Antibody or Antibody Product, or [*] the [*] to [*] any Antibody or Antibody Product, except to the extent such [*]. During the Term of this Agreement, Kirin shall [*] the [*] to [*] any Antibody or Antibody Product, or [*] the [*] to [*] any Antibody or Antibody Product, except to the extent such [*] is [*]. 16.4 Knowledge; Officers. For the purposes of this Article XVI, (a) "knowledge of" a Party shall mean [*], and (b) "officers" shall mean, in the case of Medarex, persons in the positions of vice president, senior vice president, president and chief executive officer, and in the case of Kirin, person in the positions of president and vice president of the Pharmaceutical Division of Kirin. 16.5 Limitation of Warranty. EXCEPT FOR THE EXPRESS WARRANTIES SET FORTH IN THIS AGREEMENT, KIRIN AND MEDAREX GRANT NO WARRANTIES, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, BY STATUTE OR OTHERWISE; AND ANY MICE, MICE MATERIALS, COLLABORATION ANTIBODIES AND ANTIBODY MATERIALS RELATING THERETO SUPPLIED TO A PARTY, ITS AFFILIATES, PARTNERS OR IN-HOUSE COLLABORATORS PURSUANT TO THIS AGREEMENT ARE SUPPLIED "AS IS", AND KIRIN AND MEDAREX EACH SPECIFICALLY DISCLAIM ANY OTHER WARRANTIES, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF QUALITY, WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR ANY WARRANTY AS TO THE VALIDITY OF ANY PATENT OR THE NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -136-


 ARTICLE XVII DISPUTE RESOLUTION 17.1 General. If a Dispute arises between the Parties in any context other than with regard to whether Rights Preserving Excuse have been triggered or whether a proposed Cure is adequate, which are governed by Section 8.11, the Parties shall use the following procedure in good faith prior to either Party pursuing other available judicial or nonjudicial remedies: 17.1.1 Meeting. A meeting shall be held between the Parties within [*] days after either Party gives the other Party a Dispute Notice. The meeting shall be attended by a representative of each Party having decision-making authority regarding the Dispute (subject to Board of Directors or equivalent approval, if required), who shall attempt in good faith to negotiate a resolution of the Dispute. 17.1.2 Arbitration. If, within [*] days after the Dispute Notice, the Parties have not succeeded in negotiating a written resolution of the Dispute, and a Party desires to pursue further resolution of the Dispute, such Party shall refer the Dispute to [*] in accordance with the Commercial Dispute Resolution Procedures of the American Arbitration Association ("AAA"), and at the election of either Party or an arbitrator in appropriate instances, the optional AAA rules for "Large, Complex Commercial Disputes" (except that with respect to any such rules specific provisions of this Article XVII hereof shall override inconsistent provisions of such rules) to be held in San Diego, California. The Parties shall promptly negotiate in good faith to appoint an Expert. If the Parties cannot agree on the appointment of an Expert to serve as arbitrator within [*] days after receipt of a demand for arbitration, each Party shall appoint one Expert to serve as an arbitrator, and the two arbitrators shall appoint a third Expert to serve as arbitrator. If the Party-appointed arbitrators cannot agree on the third Expert to serve as arbitrator, the third arbitrator shall be appointed in accordance with the Commercial Arbitration Rules of the American Arbitration Association. The arbitrator(s) shall hold a hearing to resolve the issues within [*] days after selection. 17.1.3 [*] The Parties acknowledge and agree that, to the extent consistent with expedited process and not resulting in any significant delay of the arbitration, each Party will have the right to [*], including, without limitation, [*] by the other Party to [*] in the arbitration proceeding, and that (subject to this Section 17.1.3) the [*] shall be [*] of the matters in dispute as [*] by the appointed arbitrators. 17.1.4 [*] The Parties shall participate in good faith in the arbitration to its conclusion. The recommendation of the arbitrator(s) shall be [*] upon the Parties, except that [*]. A judgment on the arbitrator's disposition may be entered in any court having jurisdiction over the Parties. 17.2 Interim Relief. Notwithstanding anything herein to the contrary, nothing in this Section shall preclude either Party from seeking interim or provisional relief from a court located in the State of California, including a temporary restraining order, preliminary injunction or other interim equitable relief concerning a Dispute, either prior to or during the arbitration, if necessary to protect the interests of such Party in the event of certain breaches which will result in irreparable and continuing damage to the other Party for which there will be no adequate remedy at law. 17.3 Language. The arbitration proceedings and all written evidence shall be in the English language. Any written evidence originally in a language other than English shall be submitted in English translation accompanied by the original or a true copy thereof. Any recommended resolution provided by [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -137-


 the arbitrator(s), and any explanation of the reasons for such recommended resolution, shall be in the English language. 17.4 Covenant Relating to "WHEREAS" Clauses. Medarex and Kirin each covenants to the other that, in the event of any litigation, arbitration or other dispute resolution proceeding to determine claims by Medarex or by Kirin (or any of either Party's Affiliates, successors or assigns) that the other Party's Exploitation of the Kirin Mice, Kirin Technology, Medarex Mice, Medarex Technology, KM-Mice, KM Patent Rights, and/or KM Know-How would infringe patent or other intellectual property rights of either Medarex or Kirin (or any of either Party's Affiliates, successors or assigns), neither Party (nor any of either Party's Affiliates, successors or assigns) will make reference to the fifth or sixth "WHEREAS" clause of this Agreement, or the drafting history of those clauses, as evidence or support for any contention or determination that either Medarex or Kirin (or any of either Party's Affiliates, successors or assigns) has made any concession concerning the validity, weight, or substantiality of such claims, or any concession that such claims have a reasonable basis. ARTICLE XVIII MISCELLANEOUS 18.1 Force Majeure. Neither Party shall be held liable or responsible to the other Party or be deemed to have defaulted under or breached this Agreement for failure or delay in fulfilling or performing any term of this Agreement when such failure or delay is caused by or results from causes beyond the reasonable control of the non-performing Party, including earthquakes, fires, floods, embargoes, shortages, epidemics, quarantines, war, acts of war (whether war be declared or not), insurrections, riots, civil commotion, strikes, lockouts or other labor disturbances, acts of God or acts, omissions or delays in acting by any governmental authority. The non-performing Party shall notify the other Party of such force majeure within [*] business days after such occurrence by giving written notice to the other Party stating the nature of the event, its anticipated duration, and any action being taken to avoid or minimize its effect. The suspension of performance shall be of no greater scope and no longer duration than is necessary and the non-performing Party shall use [*] to remedy its inability to perform; provided, however, that in the event the suspension of performance continues for [*] days after the date of the occurrence, and such failure to perform would constitute a material breach of this Agreement in the absence of such force majeure, the performing Party may terminate this Agreement pursuant to Section 14.2 hereof by written notice to the other Party. 18.2 Governing Law. This Agreement is to be governed by and construed in accordance with the laws of [*], without reference to the rules of conflict of laws thereof. 18.3 Notices. 18.3.1 Except as otherwise provided in Sections 3.3.1(d) and 3.5.2 hereof, with respect to which Sections the method and address for delivery of notices, inquiries or communications required pursuant to such Sections shall be governed by the terms of such Sections, all notices, inquiries and other communications that are required or permitted to be made by a Party to the other Party under Articles II, III, IV, V, VI and VII hereof shall be made in writing in the English language and (i) delivered electronically via email to the two (2) addressees listed below (and in the case of delivery by email hereunder, confirmed by a copy sent by internationally-recognized overnight courier addressed as set forth below within one (1) day of dispatching the emails), or (ii) sent by internationally-recognized overnight courier, addressed as follows: [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -138-


 If to Kirin, emails to: [*] and [*] and by courier to: Pharmaceutical Division Kirin Brewery Co., Ltd. 26-1, Jingumae 6-chome, Shibuya-ku, Tokyo, 150-8011 Japan Attention: Vice President, Planning Department If to Medarex, emails to: [*] and [*] and by courier to: Medarex, Inc. 707 State Road, Suite 206 Princeton, New Jersey ###-###-#### Attention: General Counsel Telecopier: (609) 430-4215 or to such other address as the Party to which notice is to be given may have furnished to the other Party in writing in accordance herewith. Any such notice, inquiry or other communication shall be deemed to have been given (i) if sent by email, the earliest date and time at which it is received by both addressees listed above for Medarex or Kirin, as the case may be, or (ii) if sent by internationally-recognized overnight courier without prior email receipt by both addressees listed above for Medarex or Kirin, as the case may be, the date and time of receipt, which receipt shall be evidenced by a written acknowledgment of receipt signed by such Party. 18.3.2 Except as otherwise provided in Section 18.3.1 hereof, all notices or other communications that are required or permitted hereunder shall be in writing in the English language and delivered personally, sent by facsimile (and promptly confirmed by a copy sent by personal delivery, registered or certified mail or overnight courier as provided herein), sent by internationally-recognized overnight courier or sent by registered or certified mail, postage prepaid, return receipt requested, addressed as follows: If to Kirin, to: Pharmaceutical Division Kirin Brewery Co., Ltd. 26-1, Jingumae 6-chome, Shibuya-ku, Tokyo, 150-8011 Japan Attention: President Telecopier: +81-3-5485-6765 with copies to: [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -139-


 Gemini Science, Inc. 4275 Executive Square, Suite 940 La Jolla, CA 92037 Attention: President Telecopier: (858) 558-7689 and Clifford Chance Rogers & Wells LLP 3811 Valley Centre Drive San Diego, CA 92130-3318 Attention: Maria Sendra, Esq. Telecopier: (858) 720-3501 If to Medarex, to: Medarex, Inc. 707 State Road, Suite 206 Princeton, New Jersey ###-###-#### Attention: President Telecopier: (609) 430-2850 with copies to: Medarex, Inc. 707 State Road, Suite 206 Princeton, New Jersey ###-###-#### Attention: General Counsel Telecopier: (609) 430-4215 and Covington & Burling One Front Street San Francisco, California 94111 Attention: James C. Snipes, Esq. Telecopier: (415) 591-6091 or to such other address as the Party to which notice is to be given may have furnished to the other Party in writing in accordance herewith. Any such communication shall be deemed to have been given (a) when delivered, if personally delivered or sent by facsimile on a business day, (b) on the [*] business day after dispatch, if sent by internationally-recognized overnight courier, and (c) on the [*] business day following the date of mailing, if sent by mail. It is understood and agreed that this Section 18.3.2 hereof is not intended to govern the day-to-day business communications necessary between the Parties in performing their duties, in due course, under the terms of this Agreement; provided, however that those communications cannot constitute or excuse the need for the formal notices required by the Agreement. 18.3.3 Each notice, inquiry or other communication that is provided by one Party to the other Party hereunder shall indicate the Section(s) of this Agreement, if any, pursuant to which such notice, inquiry or other communication is provided. For the avoidance of doubt, it is understood and [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -140-


 agreed that in the event that a Party fails to include such Section reference(s) in a notice, inquiry or other communication, or that a Party inadvertently includes the incorrect Section reference(s), it shall not be a breach of such Party's obligations under this Agreement. 18.4 Assignment. Except as otherwise provided in this Section 18.4, neither this Agreement nor any interest hereunder shall be directly or indirectly assigned or transferred (whether voluntarily, by operation of law, or otherwise) by either Party without prior written consent of the other Party; provided, however, that either Kirin or Medarex may assign or transfer this Agreement without the consent of the other Party (a) to any Kirin Affiliate or Medarex Affiliate, respectively, in accordance with this Agreement; or (b) to any Third Party with which it may merge or consolidate, or which acquires all or substantially all of its voting securities, or to which it may transfer all or substantially all of its assets to which this Agreement relates if in any such event (i) the assigning Party shall provide written notice to the other Party of such assignment, (ii) in the event that the assigning Party is not the surviving entity, it remains jointly and severally liable under this Agreement with the relevant Kirin Affiliate, Medarex Affiliate or Third Party assignee, and (iii) the relevant Kirin Affiliate or Medarex Affiliate assignee, Third Party assignee or surviving entity assumes in writing all of the assigning Party's obligations under this Agreement. For purposes of clarification with respect to subsection (b) herein, a Third Party that merges or consolidates with a Party, or to which a Party transfers all or substantially all of its assets to which this Agreement relates, shall not be deemed to grant the other Party to this Agreement any license to such Third Party's technology (as opposed to such Party's Technology) in existence as of the effective date of such merger, consolidation or transfer, unless such grant is made pursuant to a separate agreement. For purposes of this Section 18.4, "voting securities" includes presently authorized voting securities and securities into which such securities may hereafter be changed or by which such voting securities may be exchanged after giving effect to the terms of such change or exchange by way of cancellation and reissuance of voting securities, reorganization, recapitalization, consolidation or otherwise. Any purported assignment or transfer in violation of this Section shall be void. 18.5 Entire Agreement; Modifications. This Agreement, the exhibits hereto and the cross-receipt delivered by each Party on the date of execution of this Agreement (and all documents attached thereto) set forth and constitute the entire agreement and understanding between the Parties with respect to the subject matter hereof and all prior agreements, understandings, promises and representations, whether written or oral, with respect thereto, including, without limitation, the Agreement on Essential Terms for Collaboration and that certain Agreement Governing Transfer of Materials between Medarex and Kirin effective as of December 27, 1999, as amended, are superseded hereby. Each Party confirms that it is not relying on any representations or warranties of the other Party except as specifically set forth herein. No amendment, modification, release or discharge hereof shall be binding upon the Parties unless in writing and duly executed by authorized representatives of both Parties. 18.6 Severability. In the event that any provision of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or void, this Agreement shall be modified to provide the maximum rights and benefits that are enforceable and otherwise shall continue in full force and effect without said provision; provided that no such severability shall be effective if it materially changes the economic or intellectual property benefit of this Agreement to either Kirin or Medarex. In the event that any provision of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or void, and severability of such provision would materially change the economic benefit of this Agreement to either Kirin or Medarex, Kirin and Medarex shall modify such provision in accordance with Section 18.5 hereof to obtain a legal, enforceable and valid provision and provide an equivalent economic business or intellectual property benefit to Kirin and Medarex that most nearly effects Kirin's and Medarex's intent in entering into this Agreement. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -141-


 18.7 Waiver. No waiver of any rights shall be effective unless assented to in writing by the Party to be charged and the waiver of any breach or default shall not constitute a waiver of any other right hereunder or any subsequent breach or default. 18.8 Independent Contractors. It is expressly agreed that Medarex, on the one hand, and Kirin, on the other hand, shall be independent contractors and that the relationship between the two Parties shall not constitute a partnership, joint venture or agency. Except otherwise expressly set forth herein, neither Medarex, on the one hand, nor Kirin, on the other hand, shall have the authority to make any statements, representations or commitments of any kind, or to take any action, which shall be binding on the other, without the prior written consent of the other Party to do so. All persons employed by a Party shall be employees of such Party and not of the other Party and all costs and obligations incurred by reason of any such employment shall be for the account and expense of such Party. 18.9 Language. This Agreement is written and executed in the English language. Any translation into any other language shall not be an official version thereof, and in the event of any conflict in interpretation between the English version and such translation, the English version shall control. 18.10 Descriptive Headings. The headings of the several sections of this Agreement are intended for convenience of reference only and are not intended to be a part of or to affect the meaning or interpretation of this Agreement. 18.11 Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 18.12 No Third Party Rights. No provision of this Agreement shall be deemed or construed in any way to result in the creation of any rights or obligations in any other individual group, entity or organization not a party to this Agreement. 18.13 Further Assurances. Each Party hereby agrees to duly execute and deliver, or cause to be duly executed and delivered such further instruments and do and cause to be done such further acts and things, including without limitation, the filing of such additional assignments, agreements, documents and instruments, that may be necessary or as the other Party hereto may at any time and from time to time reasonably request in connection with this Agreement or to carry out more effectively the provisions and purposes hereof or to better assure and confirm unto such other Party its rights and remedies under this Agreement. 18.14 Cumulative Remedies. Unless expressly set forth herein to the contrary, all remedies set forth herein are cumulative and are in addition to any and all remedies provided either Party at law or in equity. 18.15 Attorneys' Fees. In the event it becomes necessary for either Party (or any of its Affiliates) to institute any legal action, including, without limitation, an arbitration pursuant to Article XVII hereof, against the other Party to enforce its rights hereunder, the prevailing Party shall be entitled to recover from the non-prevailing Party reasonable attorneys' fees, court costs or arbitration costs as applicable, and expenses related to such action. [SIGNATURE PAGE TO FOLLOW] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -142-


 IN WITNESS WHEREOF, the undersigned are duly authorized to execute this Agreement on behalf of Kirin and Medarex, as applicable. KIRIN BREWERY CO., LTD. MEDAREX, INC. By: /s/ Katsuhiko Asano By: /s/ Donald L. Drakeman Katsuhiko Asano, Ph.D. Donald L. Drakeman, Ph.D., J.D. President, Pharmaceutical Division President and Chief Executive Officer GENPHARM INTERNATIONAL, INC. By: /s/ Michael A. Appelbaum Michael A. Appelbaum, J.D. President and Chief Operating Officer [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. -143-


 
 
[*] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.
 
Exhibit A-1


 EXHIBIT B [*] [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit B-1


 EXHIBIT C Medarex In-License Agreements 1. Agreement between Abgenix, Inc., Cell Genesys, Inc., Japan Tobacco Inc. and Xenotech L.P., on the one hand, and GenPharm International, Inc., on the other hand, effective as of March 26, 1997. 2. Agreement between Medical Research Council and GenPharm International, Inc., effective October 1, 1993, as amended on August 12, 1994 and on April 19, 2002. 3. Agreement between Pharming B.V. and GenPharm International, Inc., effective as of July 1, 1996, as amended on November 29, 1996. 4. Agreement between DNX, Inc. and GenPharm International, Inc., effective as of January 1, 1991. 5. Agreement between The University of Utah Research Foundation and GenPharm International Inc., effective as of June 15, 1989. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit C-1


 EXHIBIT D Kirin In-License Agreements None. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit D-1


 EXHIBIT E [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit E-1


 EXHIBIT F [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit F-1


 EXHIBIT G [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit G-1


 EXHIBIT H [*] [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit H-1


 EXHIBIT I Database Description The Target Database is a two-tier client server database, with Microsoft-SQL 2000 serving as the backend and Microsoft Access & Visual Basic components making up the front end. Connection to the database is through native ADO using the TCP/IP protocol. The design and implementation of the database was performed using Microsoft best practices for designing 2-tier client server applications. The Target Database is currently operating on a Dell 2450 server with a redundant disk array (Level 5) with a total disc capacity of approximately 200 gigabytes. The database security is encapsulated in the application and uses a trusted user security model. The trusted user has been granted read, write and update access rights to the database objects (views, triggers, tables, and stored procedures). This user is used to form the initial connection to the database only from the Medarex internal network. Once the initial connection is formed, users are challenged for access credentials. The benefit of this security model is that only the trusted user can connect to the database, no third party tools can be used to circumvent application security. The password for the trusted user is held by the database administrator. The database has two types of auditing: activity logs and change logs. The activity logs are used to track user activity in the database including what users are viewing and reporting on and the date and time at which such activity occurs. The change logs are available only to the database administrator and are used to record any data associated with changes made to data records. Backups of the Target Database are performed using Hewlett-Packard SureStore tape libraries at the end of every twenty-four (24) hour period using a standard Grandfather-Father-Son tape rotation system, which provides for a backup to be taken offsite every week. Protection from site disaster is accounted for by keeping backup tapes off site using a third party contractor. The database server is under electronic key pad security in the Medarex, Milpitas, California server room. The room is under a controlled environment and has the benefit of a hidden camera on a motion sensor monitoring the room continuously (twenty-four (24) hours per day, seven (7) days per week). [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit I-1


 EXHIBIT J Kirin Trademarks - ---------------------------------------------------------------------------------------------------------------- Trademark Country The International Application No. Registration No. Classification - ---------------------------------------------------------------------------------------------------------------- T C Mouse Japan ###-###-#### TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse Taiwan 31 939534 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse South Korea 31 491229 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse China 31 1590720 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse US 31 907867 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse Canada 31 1045600 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse Switzerland 31 474595 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse CTM(*) 31 001484724 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse New Zealand 31 607444 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- T C Mouse Australia 31 822044 TransChromoMouse - ---------------------------------------------------------------------------------------------------------------- TC Mouse Unregistered and no applications filed in any country. - ---------------------------------------------------------------------------------------------------------------- (*) CTM (= the Community trademark) The current Member States are: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain, Sweden, United Kingdom [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended Exhibit J-1


 EXHIBIT K KM Trademarks - ------------------------------------------------------------------------------------------------------ Trademark Country The International Application No. Registration No. Classification - ------------------------------------------------------------------------------------------------------ KM-Mouse Canada 31 1124419 - ------------------------------------------------------------------------------------------------------ KM-Mouse CTM(*) 31 0025485592 - ------------------------------------------------------------------------------------------------------ KM-Mouse US 31 Proposed - ------------------------------------------------------------------------------------------------------ (*) CTM (= the Community trademark) The current Member States are: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain, Sweden, United Kingdom. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit K-1


 EXHIBIT L Medarex Trademarks - ------------------------------------------------------------------------------------------------ Trademark Country The International Application No. Registration No. Classification - ------------------------------------------------------------------------------------------------ HuMAb-Mouse Canada 31 1106569 - ------------------------------------------------------------------------------------------------ HuMAb-Mouse CTM(*) 31, 42 002274314 - ------------------------------------------------------------------------------------------------ HuMAb-Mouse US - 74/490,454 2,234,442 - ------------------------------------------------------------------------------------------------ (*) CTM (= the Community trademark) The current Member States are: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain, Sweden, United Kingdom. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit L-1


 EXHIBIT M Pre-Existing Project Agreements Covering HuMAb License Projects and Partner Projects Kirin Agreement. 1. A Research and Commercialization Agreement between Kirin and Corixa Corporation dated April 15, 2001. Medarex Agreements. - ------------------ 1. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Amgen, Inc. dated September 21, 1999, as amended on November 16, 1999, January 26, 2000, May 22, 2000, December 7, 2000, and December 27, 2000. 2. An Amended and Restated Material Transfer and Confidentiality and Option Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Bristol-Myers Squibb Company dated June 11, 1998, as amended effective as of June 11, 2001. 3. A Research and Commercialization Agreement between Medarex, Inc, GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and B. Twelve, Inc. dated January 15, 2001. 4. An Evaluation and Commercialization Agreement between Medarex, Inc, and GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Centocor, Inc. dated April 5, 2000. 5. A Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Coulter Pharmaceutical, Inc. dated March 30, 2000. 6. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Eli Lilly and Company dated November 3, 2000. 7. A Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and EOS Biotechnology, Inc. dated August 2, 1999, as amended and restated on March 17, 2000. 8. A Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., Medarex, Inc., and FibroGen, Inc. dated July 9, 1998, as amended on June 30, 2001. 9. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Genesto A/S dated August 13, 2001. 10. An Evaluation and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., Medarex, Inc., and Genmab A/S dated February 25, 1999, as amended on May 17, 1999, May 19, 1999, and August 23, 2000. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit M-1


 11. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Human Genome Sciences, Inc. dated May 23, 2001. 12. An Evaluation, Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Immunex Corporation dated January 11, 1999. 13. An Evaluation and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Leukosite, Inc. dated February 24, 1999. 14. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and MedImmune, Inc. dated June 9, 2000. 15. An Evaluation, Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Novartis Pharma AG dated November 6, 1998. 16. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and NovImmune S.A. dated April 6, 2001. 17. A Research and Commercialization agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Novo Nordisk A/S dated December 22, 2000. 18. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Oxford GlycoSciences (UK) Limited dated August 27, 2001. 19. A Research and Commercialization agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., Medarex, Inc., and Raven Biotechnologies, Inc. dated March 24, 2000. 20. A Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., Medarex, Inc., and Schering AG dated February 9, 1998, as amended on May 11, 1999. 21. A Research and Commercialization Agreement between Medarex, Inc., GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and Schering-Plough Ltd. dated March 26, 2001. 22. A Research and Commercialization Agreement between GenPharm International, Inc., a wholly owned subsidiary of Medarex, Inc., and ZymoGenetics, Inc. dated October 6, 2000. [*]=Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. Exhibit M-2