JOINT FILING AGREEMENT
Page 1 of 1
Exhibit 1
Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned
hereby agree, as of August 14, 2007, that only one statement containing the information required by
Schedule 13G, and each amendment thereto, need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Curis, Inc.. and such statement to which this Joint
Filing Agreement is attached as Exhibit 1 is filed on behalf of each of the undersigned.
| RA CAPITAL BIOTECH FUND, L.P. | ||||||
| By: | RA Capital Management, LLC General Partner |
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| By: | /s/ Xxxxxxx X. Xxxxxxx
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| Xxxxxxx X. Xxxxxxx | ||||||
| Manager | ||||||
| RA CAPITAL BIOTECH FUND II, L.P. | ||||||
| By: | RA Capital Management, LLC General Partner |
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| By: | /s/ Xxxxxxx X. Xxxxxxx
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| Xxxxxxx X. Xxxxxxx | ||||||
| Manager | ||||||
| RA CAPITAL MANAGEMENT, LLC | ||||||
| By: | /s/ Xxxxxxx X. Xxxxxxx
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| Xxxxxxx X. Xxxxxxx | ||||||
| Manager | ||||||
| XXXXXXX X. XXXXXXX | ||||||
| /s/ Xxxxxxx X. Xxxxxxx | ||||||
| XXXXX XXXXXXXXXX | ||||||
| /s/ Xxxxx Xxxxxxxxxx | ||||||
