JOINT FILING AGREEMENT
Exhibit 99.1
The
undersigned hereby agree that the Statement on Schedule 13G dated August 26,
2009 with respect to the shares of Common Stock of Ligand Pharmaceuticals
Incorporated and any further 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:
August 26, 2009
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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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BVF
INVESTMENTS, L.L.C.
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By:
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/s/
Xxxx X. Xxxxxxx
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By:
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BVF
Partners L.P., its manager
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Xxxx
X. Xxxxxxx
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President
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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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/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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