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www.idenix.com. Please log in approximately 10 minutes before the call to ensure a timely connection. A replay of the conference call and webcast will be available until June 26, 2007. To access the replay, please dial (800) 642-1687 U.S./Canada or (706) 645-9291 International and enter the passcode 3143678.

About Idenix

Idenix Pharmaceuticals, Inc., headquartered in Cambridge, Massachusetts, is a biopharmaceutical company engaged in the discovery, development and commercialization of drugs for the treatment of human viral and other infectious diseases. Idenix's current focus is on the treatment of infections caused by hepatitis B virus, hepatitis C virus and HIV. For further information about Idenix, please refer to http://www.idenix.com.

Forward-looking Statements

This press release contains "forward-looking statements" within the meaning of The Private Securities Litigation Reform Act of 1995. Such forward- looking statements can be identified by the use of forward-looking terminology such as "will," "can be," "expect," "anticipates," "advance," "significant achievement," "pending," "encouraging," "believe," or similar expressions and implied statements with respect to the regulatory success of valopicitabine or the Idenix clinical development program in hepatitis C, or any potential pipeline candidates and expectations with respect to the size of the market for Hepatitis C. Such forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance or achievements expressed or implied by such statements. In particular, management's expectations could be affected by unexpected regulatory actions or delays; results of clinical trials, including additional data relating to the ongoing or future clinical trials evaluat
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