Can gene therapy be harnessed to fight the AIDS virus?
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)