------------------- CUSIP No. 452327109 13 G Page 24 of 25 Pages ------------------- -------------------
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CUSIP No. 000000000 13 G Page 24 of 25 Pages
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Exhibit 99.1
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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, 2001 VENROCK ASSOCIATES
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
General Partner
February 14, 2001 VENROCK ASSOCIATES II, L.P.
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
General Partner
February 14, 2001 VENROCK ENTREPRENEURS FUND, L.P.
By: Venrock Management LLC, its
General Partner
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
Member
February 14, 2001 VENROCK MANAGEMENT LLC
By: /s/ Xxxxxxx X. Xxxxx
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Xxxxxxx X. Xxxxx
Member
February 14, 2001 GENERAL PARTNERS / MEMBERS
/s/Xxxxxxx X. Xxxxxx
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Xxxxxxx X. Xxxxxx
/s/Xxxxxx X. Xxxxx
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Xxxxxx X. Xxxxx
/s/Xxxx Xxxxxxxx
----------------------------------
Xxxx Xxxxxxxx
/s/Xxxxxxx X. Xxxxx
----------------------------------
Xxxxxxx X. Xxxxx
/s/Xxxxxx X. Xxxxxxxxx
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Xxxxxx X. Xxxxxxxxx
/s/Xxxxx X. Xxxxxxxx
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Xxxxx X. Xxxxxxxx
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CUSIP No. 000000000 13 G Page 25 of 25 Pages
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/s/Xxxxxxx X. Xxxxxxxxx
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Xxxxxxx X. Xxxxxxxxx
/s/Xxx X. Xxxxxxxx
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Xxx X. Xxxxxxxx
/s/Xxxxxxxxx X. Xxxxxxxxxxx
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Xxxxxxxxx X. Xxxxxxxxxxx
/s/Xxxxxxx Sun
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Xxxxxxx Sun
/s/Xxxxxxx X. Xxxxxxx
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Xxxxxxx X. Xxxxxxx
