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EXHIBIT 99.1
JOINT FILING AGREEMENT
We, the signatories of the statement to which this Joint
Filing Agreement is attached, hereby agree that such statement is
filed, and any amendments thereto filed by either or both of us will be
filed, on behalf of each of us.
Dated: April 5, 2000.
VULCAN VENTURES INCORPORATED
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx, Vice President
*
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Xxxx X. Xxxxx
*By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx as Attorney-in Fact for
Xxxx X. Xxxxx pursuant to a Power of
Attorney filed on August 30, 1999, with the
Schedule 13G of Vulcan Ventures Incorporated
and Xxxx X. Xxxxx for Pathogenesis, Inc. and
incorporated herein by reference.
