Joint Filing Agreement
Exhibit 99.1
The undersigned hereby agree that the Statement on Schedule 13G dated April 20, 2012 with respect to the shares of Common Stock of Pain Therapeutics, Inc., and any amendments thereto executed by each and any 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)(1) under the Securities Exchange Act of 1934, as amended.
Dated:April 20, 2012
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BIOTECHNOLOGY VALUE FUND, L.P.
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INVESTMENT 10, L.L.C.
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By:
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BVF Partners L.P., its general partner
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By:
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BVF Partners L.P., its investment manager
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By:
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BVF Inc., its general partner
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By:
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BVF Inc., its general partner
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By:
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/s/ Xxxx X. Xxxxxxx
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By:
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/s/ Xxxx X. Xxxxxxx
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Xxxx X. Xxxxxxx
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Xxxx X. Xxxxxxx
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President
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President
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BIOTECHNOLOGY VALUE FUND II, L.P.
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BVF PARTNERS L.P.
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By:
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BVF Partners L.P., its general partner
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By:
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BVF Inc., its general partner
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By:
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BVF Inc., its general partner
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By:
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/s/ Xxxx X. Xxxxxxx
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Xxxx X. Xxxxxxx
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By:
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/s/ Xxxx X. Xxxxxxx
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President
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Xxxx X. Xxxxxxx
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President
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BVF INC.
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By:
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/s/ Xxxx X. Xxxxxxx
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Xxxx X. Xxxxxxx
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President
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/s/ Xxxx X. Xxxxxxx
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XXXX X. XXXXXXX
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