Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Double asterisks denote omissions.

We represent Bank of America, N.A., in its capacity as administration agent, pursuant to certain financing arrangements with, among others, Emergent BioDefense Operations Lansing LLC.

On behalf of Bank of America, N.A. and in connection with Contract No. 200-2011-42084, please find enclosed one (1) Instrument of Assignment of Monies Due and to Become Due signed by EMERGENT BIODEFENSE OPERATIONS LANSING LLC, a Delaware limited liability company, and one (1) original and three (3) copies of a Notice of Assignment signed by BANK OF AMERICA, N.A., all relating to the above referenced contract. Please also find enclosed a copy of an action by unanimous written consent authorizing the execution of the instrument of Assignment of Monies Due and to Become Due by Emergent BioDefense Operations Lansing LLC.

Upon completion of your review and execution of the Notice of Assignment, please make all necessary changes to assign the proceeds of this contract to the payment remittance information set forth in the Notice of Assignment.  Please fax a copy of this letter, along with the executed Notice of Assignment (one (1) copy) and any modifications issued to the contract regarding this change, to my attention at ###-###-####.

In addition, please mail one (1) original set of the Assignment documents including a copy of any change order or modification issued subsequently, to my attention at Morgan, Lewis & Bockius LLP, 225 Franklin Street, Floor 16, Boston, MA 02110.

Should you have any questions, please do not hesitate to contact me by telephone at ###-###-#### or by e-mail at ***@***.  Thank you for your time and prompt attention regarding this matter.

Reference is hereby made to Contract No. 200-2011-42084, dated as of September 30, 2011, entered into between EMERGENT BIODEFENSE OPERATIONS LANSING LLC, a Delaware limited liability corporation (the "Contractor") and the Centers for Disease Control and Prevention, Procurement and Grants Office (the "Contract") to provide supplies and/or services according to the above referenced Contract.

Moneys due or to become due under the contract described above have been assigned to Bank of America, N.A., in its capacity as administrative agent (DUNS No. 055169452-0026) (CAGE Code 65LS5) under the provisions of the Assignment of Claims Act of 1940, as amended, 31 U.S.C. § 3727, 41 U.S.C. § 15 and the Federal Acquisition Regulations ("FAR") relating thereto (48C.F.R. 32.800-32.806).

A true copy of the instrument of assignment executed by the Contractor on December 11, 2013 is attached to this original notice.

Payments due or to become due under the Contract should be made to the undersigned assignee as follows:

Please return to the undersigned, at your earliest convenience, the three enclosed copies of this notice, executed, with appropriate notations showing the date and hour of receipt, and duly signed by the person acknowledging receipt on behalf of the addressee.  Please distribute a copy to the appropriate party in the accounts payable office for your agency.

Know all men by these presents that Emergent Biodefense Operations Lansing LLC, a Delaware limited liability company, with an office at 3500 N. Martin Luther King Jr. Boulevard, Lansing, Michigan 48906 (hereinafter called the "Assignor"), in consideration of financial accommodations provided or to be provided, and for other good and valuable consideration, the receipt of which is hereby acknowledged, does hereby sell, assign, set over, transfer, pledge and convey (under the Assignment of Claims Act 31 USC Section 3727, 41 USC Section 15 and the Federal Acquisition Regulations ("FAR") relating thereto (48 C.F.R. 32.800-32.806)) to Bank of America, N.A. (DUNS No. 055169452-0026) (CAGE Code 65LS5), in its capacity as Administrative Agent under the Credit Agreement (as such term is hereinafter defined) (hereinafter called the "Assignee"), all of Assignor's right, title and interest which Assignor now has or may have in and to all monies due and to become due from the United States of America or from any agency or department thereof under that certain contract listed on the attached Exhibit A, which exhibit is made a part of this Assignment (the "Contract"), between the United States of America acting through the agency listed on Exhibit A and the Assignor, and under any and all amendments and modifications of the Contract and supplements to the Contract.

The Assignor hereby authorizes the Assignee to receive and collect any amount or amounts due or to become due under the Contract, and under any and all amendments and modifications of the Contract and supplements to the Contract, and to receive and collect the same as fully and to the same extent as if said moneys were its own funds and to apply said money to repayment of any loans, other credit extensions or other amounts owning pursuant to that certain credit agreement, dated December 11, 2013, as the same may be amended, restated, amended and restated, extended, supplemented or otherwise modified from time to time (the "Credit Agreement") by and among the Assignor, the Assignee and certain other parties, pursuant to which various banks and other financing institutions have agreed to make loans and provide other extensions of credit for the purpose, among others, of financing the Assignee in the performance of the Contract.

The Assignor hereby further authorizes and directs the United States of America to make all payments due under the Contract and any and all amendments or modifications of the Contract and supplements to the Contract direct to the Assignee by ACH or other electronic transfer, check or other orders, payable to the order of the Assignee.

IN WITNESS WHEREOF, the Assignor has caused this instrument to be signed, sealed, and delivered by its proper officer thereunto duly authorized this 11^th day of December, 2013.

The undersigned, Shawnte M. Mitchell, the Secretary of the Assignor, hereby certifies that Robert G. Kramer, who executed the foregoing instrument, is the duly elected, qualified, and acting Treasurer of the Assignor and is an authorized signer of the Assignor and that the signature set forth above his/her name is his/her genuine signature.

On this 02 day of December, 2013, before me, the undersigned Notary Public, personally appeared Robert G. Kramer, who acknowledged himself/herself to be the Treasurer of Emergent Biodefense Operations Lansing LLC, a Delaware limited liability company, and that he/she, as Treasurer, being authorized so to do, executed the foregoing instrument for the purposes therein contained, by signing the name of the limited liability company by himself/herself as Robert G. Kramer.  In witness whereof, I hereunto set my hand and official seal.