RT Journal Article SR Electronic T1 HIV Virulence JF Science JO Science FD American Association for the Advancement of Science SP 1288 OP 1288 DO 10.1126/science.343.6177.1288-i VO 343 IS 6177 YR 2014 UL http://science.sciencemag.org/content/343/6177/1288.9.abstract AB