AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G
Exhibit A
AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G
The undersigned hereby agree as follows:
(i) Each of them is individually eligible to use the Schedule 13G to which this Exhibit is
attached, and such Schedule 13G is filed on behalf of each of them; and
(ii) Each of them is responsible for the timely filing of such Schedule 13G and any amendments
thereto, and for the completeness and accuracy of the information concerning such person contained
therein; but none of them is responsible for the completeness or accuracy of the information
concerning the other persons making the filing, unless such person knows or has reason to believe
that such information is inaccurate.
Date: May 4, 2007
RA CAPITAL MANAGEMENT, LLC | ||||||
By: | /s/ Xxxxxxx X. Xxxxxxx
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Manager | ||||||
RA CAPITAL BIOTECH FUND, L.P. | ||||||
By: | RA Capital Management, LLC | |||||
General Partner | ||||||
By: | /s/ Xxxxxxx X. Xxxxxxx
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Manager | ||||||
XXXXXXX X. XXXXXXX | ||||||
/s/ Xxxxxxx X. Xxxxxxx | ||||||
Xxxxxxx X. Xxxxxxx | ||||||
XXXXX XXXXXXXXXX | ||||||
/s/ Xxxxx Xxxxxxxxxx | ||||||
Xxxxx Xxxxxxxxxx |