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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: February 11, 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.