CUSIP No. 452327109 13G Page 26 of 27 Pages
CUSIP No. 000000000 13G Page 26 of 27 Pages
Exhibit 99.1
AGREEMENT
Pursuant to Rule 13d-1(k)(1) promulgated pursuant to the
Securities Exchange Act of 1934, as amended, the undersigned agree that the
attached Schedule 13G is being filed on behalf of each of the undersigned.
February 14, 2002 VENROCK ASSOCIATES
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
General Partner
February 14, 2002 VENROCK ASSOCIATES II, L.P.
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
General Partner
February 14, 2002 VENROCK ENTREPRENEURS FUND, L.P.
By: Venrock Management LLC,
its General Partner
By: /s/ Xxxxxxx X. Xxxxx
---------------------------
Xxxxxxx X. Xxxxx
Member
February 14, 2002 VENROCK MANAGEMENT LLC
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
Member
February 14, 2002 GENERAL PARTNERS / MEMBERS
*
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Xxxxxxx X. Xxxxxx
*
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Xxxxxx X. Xxxxx
*
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Xxxx X. Xxxxxxxx
*
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Xxxxxxx X. Xxxxx
*
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Xxxxxx X. Xxxxxxxxx
/s/ Xxxxxxx X. Xxxxxxx
------------------------------------
Xxxxxxx X. Xxxxxxx
CUSIP No. 000000000 13G Page 27 of 27 Pages
*
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Xxxxx X. Xxxxxxxx
*
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Xxxxxxx X. Xxxxxxxxx
/s/ Xxxxx X. Xxxxxxx
------------------------------------
Xxxxx X. Xxxxxxx
*
------------------------------------
Xxx X. Xxxxxxxx
*
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Xxxxxxxxx X. Xxxxxxxxxxx
*
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Xxxxxxx Sun
*
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Xxxxxxx X. Xxxxxxx
* By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
Attorney-in-Fact
