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A better microscope traps gene vector

One of the major safety issues with gene therapies is integration of foreign DNA into the germline of patients, where it would cause problems in future generations. Using a test that is much more sensitive than previously used PCR tests, Avigen Inc. has detected vector DNA in the semen of the first patient given a hepatic artery infusion of its Coagulin B. But while a more sensitive test increases confidence in safety,

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