AGREEMENT
Exhibit D
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 13D/A is being filed on behalf of each of the undersigned.
January 4, 2005
| VENROCK ASSOCIATES by a General Partner VENROCK ASSOCIATES III, L.P., by its General Partner, Venrock Management III LLC VENROCK ENTREPRENEURS FUND III, L.P. by its General Partner, VEF Management III LLC |
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| By: | /s/ Xxxxx X. Xxxxxxx | |||
| Name: | Xxxxx X. Xxxxxxx | |||
| Title: | As a General Partner or Member | |||
