SECURITIES PURCHASE AGREEMENT 7,000 SHARES OF SERIES A CONVERTIBLE PREFERRED STOCK WARRANTS TO PURCHASE 7,000,000 SHARES OF CLASS A COMMON STOCKSecurities Purchase Agreement • February 29th, 2000 • Biotechnology Value Fund L P • Investment advice • New York
EXHIBIT 99A AGREEMENT REGARDING JOINT FILING The undersigned, Biotechnology Value Fund, L.P., a Delaware limited partnership, Biotechnology Value Fund II, L.P., a Delaware limited partnership, BVF Partners L.P., a Delaware limited partnership, and BVF...Joint Filing Agreement • February 29th, 2000 • Biotechnology Value Fund L P • Investment advice
The undersigned, Biotechnology Value Fund, L.P., a Delaware limited partnership, Biotechnology Value Fund II, L.P., a Delaware limited partnership, BVF Partners L.P., a Delaware limited partnership, and BVF Inc., a Delaware corporation, hereby agree and acknowledge that the statement containing the information required by Schedule 13D, to which this Agreement is attached as an exhibit, is filed on behalf of each of them. The undersigned further agree that any amendments or supplements thereto shall also be filed on behalf of each of them.
