title: Understanding the origins of AIDS viruses.
authors.forename: P M
authors.initials: PM
authors.lastname: Sharp
authors.forename: W H
authors.initials: WH
authors.lastname: Li
mesh_terms: D005075:Biological Evolution; D006678:HIV / Q000254:growth & development*; D010802:Phylogeny; D015302:Simian Immunodeficiency Virus / Q000254:growth & development*