title: Origins of the AIDS virus.
mesh_terms: D005075:Biological Evolution; D004722:Endoribonucleases / Q000235:genetics; D006678:HIV; D012194:RNA-Directed DNA Polymerase / Q000235:genetics; D012190:Retroviridae; D016914:Ribonuclease H
chemical_list: D012194:RNA-Directed DNA Polymerase; D004722:Endoribonucleases; D016914:Ribonuclease H