AGREEMENT
Exhibit 99.1
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.
| Dated: February 14, 2007 | VENROCK ASSOCIATES | |||
| By: | /s/ Xxxxx X. Xxxxxxx | |||
| Name: | Xxxxx X. Xxxxxxx | |||
| Title: | Authorized Signatory or Member | |||
| Dated: February 14, 2007 | VENROCK ASSOCIATES III, L.P. | |||
| By: | /s/ Xxxxx X. Xxxxxxx | |||
| Name: | Xxxxx X. Xxxxxxx | |||
| Title: | Authorized Signatory or Member | |||
| Dated: February 14, 2007 | VENROCK ENTREPRENEURS FUND III, L.P. | |||
| By: | /s/ Xxxxx X. Xxxxxxx | |||
| Name: | Xxxxx X. Xxxxxxx | |||
| Title: | Authorized Signatory or Member | |||
