AGREEMENT
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.
| Dated: February 17, 2009 | VENROCK ASSOCIATES |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VENROCK ASSOCIATES II, L.P. |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VENROCK ENTREPRENEURS FUND, L.P. | ||||
| By: Venrock Management,
LLC Its: General Partner |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VENROCK MANAGEMENT, LLC |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VENROCK HEALTHCARE CAPITAL PARTNERS, L.P. | ||||
| By: VHCP Management, LLC Its: General Partner |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VHCP CO-INVESTMENT HOLDINGS, LLC | ||||
| By: VHCP Management,
LLC Its: Manager |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||
| VHCP MANAGEMENT, LLC |
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| By: | /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Name: | ▇▇▇▇▇ ▇. ▇▇▇▇▇ | |||
| Title: | Authorized Signatory | |||