JOINT FILING AGREEMENTJoint Filing Agreement • February 13th, 2006 • Proquest Investments Ii Lp • Pharmaceutical preparations
The undersigned hereby agree that the statement on Schedule 13G with respect to the shares of common stock of Threshold Pharmaceuticals, Inc. is, and any amendment thereto (collectively, the "Schedule 13G") signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended. The undersigned hereby further agree that this Joint Filing Agreement be included as an exhibit to such statement and any such amendment. This Joint Filing Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.
