Exhibit 1
AGREEMENT
REGARDING JOINT FILING
The undersigned,
Efficacy Capital Ltd., Efficacy Biotech Fund, L.P., Efficacy Biotech Fund Ltd.,
Efficacy Biotech Master Fund Ltd., Xxx Xxxx Xxxxxx and Xxxx Xxxxx, hereby agree
and acknowledge that the information required by the Schedule 13D to which this
Agreement is attached as an exhibit, is filed on behalf of each of them.
The undersigned further agree that any amendments or supplements thereto shall
also be filed on behalf of each of them.
Dated: November 20, 2006
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Efficacy Biotech Fund, L.P.,
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Efficacy Capital Ltd.
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a Delaware limited partnership
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a Bermuda limited liability company
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By: Efficacy Capital
Ltd.
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/s/ Xxxx Xxxxx
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Its: General Partner
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By: Xxxx Xxxxx
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Its: Managing Partner
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/s/ Xxxx Xxxxx
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By: Xxxx Xxxxx
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Its: Managing Partner
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Efficacy Biotech Fund Limited,
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Efficacy Biotech Master Fund Ltd.,
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a Bermuda Exempted Mutual Fund
Company
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a Bermuda Exempted Mutual Fund
Company
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By: Efficacy Capital Ltd.
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By: Efficacy Capital
Ltd.
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Its: Manager
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Its: Manager
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/s/ Xxxx Xxxxx
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/s/ Xxxx Xxxxx
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By: Xxxx Xxxxx
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By: Xxxx Xxxxx
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Its: Managing Partner
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Its: Managing Partner
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/s/ Xxxx Xxxxx
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/s/ Xxx Xxxx Xxxxxx
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Xxxx Xxxxx
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Xxx Xxxx Xxxxxx
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