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In this Jan. 26, 2018 photo, Matt Chappell, right, talks with Dr. Christopher Schiessl during an appointment at a medical center in San Francisco. For more than a decade, the strongest AIDS drugs could not fully control Chappell's HIV infection. Now his body does it by itself, thanks to the first gene editing experiments in people. (AP Photo/Jeff Chiu)

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For more than a decade, the strongest AIDS drugs could not fully control Matt Chappell's HIV infection. Now his body controls it by itself, and researchers are trying to perfect the gene editing that made this possible.

By MARILYNN MARCHIONE, AP Chief Medical Writer February 13, 2018