Exhibit 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that statements on Schedules 13G and Forms 3,
4 and 5 with respect to the shares of common stock of Nuvelo, Inc. and any
amendments thereto 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 may be
included as an exhibit to such statements or amendments. This Joint Filing
Agreement may be executed in any number of counterparts, all of which taken
together shall constitute one and the same instrument.
Dated: As of April 11, 2006
/s/ Xxxxx Xxxxxx
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Xxxxx Xxxxxx, individually
RIDGEBACK CAPITAL INVESTMENTS LTD.
By:/s/ Xxxxx Xxxxxx
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Name: Xxxxx Xxxxxx
Title: Director
RIDGEBACK CAPITAL MANAGEMENT LLC.
By: /s/ Xxxxx Xxxxxx
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Name: Xxxxx Xxxxxx
Title: Managing Member