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Jay Johnson, who works for an AIDS advocacy and service organization in Philadelphia, took part in one of the studies testing gene therapy as a possible new way to treat and perhaps someday to cure HIV infections. (AP Photo/Matt Rourke)
Photo by: Matt Rourke
Jay Johnson, who works for an AIDS advocacy and service organization in Philadelphia, took part in one of the studies testing gene therapy as a possible new way to treat and perhaps someday to cure HIV infections. (AP Photo/Matt Rourke)

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