NANOGEN INC Note Agreements

[FORM OF SENIOR SECURED CONVERTIBLE BRIDGE NOTES] (Filed With SEC on August 15, 2008)

[FORM OF SENIOR SECURED CONVERTIBLE NOTES] NANOGEN, INC. SENIOR SECURED CONVERTIBLE NOTE (Filed With SEC on August 15, 2008)

[FORM OF AMENDED AND RESTATED SENIOR SECURED CONVERTIBLE NOTES] (Filed With SEC on August 15, 2008)

NANOGEN, INC. Senior Secured Convertible Note (Filed With SEC on March 28, 2008)

[FORM OF SENIOR SECURED CONVERTIBLE NOTES] NANOGEN, INC. Senior Secured Convertible Note (Filed With SEC on March 14, 2008)

NANOGEN, INC. $20 Million in 6.25% Senior Convertible Notes due 2010 and (Filed With SEC on August 27, 2007)

NANOGEN, INC. 6.25% SENIOR CONVERTIBLE NOTES DUE 2010 (Filed With SEC on August 27, 2007)

NANOGEN, INC. CONVERTIBLE PROMISSORY NOTE CONVERTIBLE PROMISSORY NOTE (Filed With SEC on May 5, 2006)