JOINT FILING AGREEMENT
Exbibit
99.1
In
accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as
amended, the undersigned hereby agree to the joint filing with all other
Reporting Persons (as such term is defined in the Schedule 13D referred to
below) on behalf of each of them of a statement on Schedule 13D (including
amendments thereto) with respect to the common stock, par value $0.001, of Cell
Genesys, Inc., and that this Agreement be included as an Exhibit to such joint
filing. The Agreement may be executed in any number of counterparts
all of which taken together shall constitute one and the same
instrument.
IN
WITNESS WHEREOF, the undersigned hereby execute this Agreement this 15th day of
May, 2009.
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Tang
Capital Partners, LP
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By:
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Tang
Capital Management, LLC
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By:
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/s/
Xxxxx X. Xxxx
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Xxxxx
X. Xxxx, Manager
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Tang
Capital Management, LLC
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By:
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/s/
Xxxxx X. Xxxx
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Xxxxx
X. Xxxx, Manager
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/s/
Xxxxx X. Xxxx
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Xxxxx
X. Xxxx
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