title: Evolution of the fittest ends in tragedy.
authors.forename: V M
authors.initials: VM
authors.lastname: Hirsch
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000209:etiology; D000818:Animals; D015704:CD4 Antigens; D019143:Evolution, Molecular; D014644:Genetic Variation; D015497:HIV-1 / Q000472:pathogenicity; D006801:Humans; D008251:Macaca; D019713:Receptors, CCR5; D015302:Simian Immunodeficiency Virus / Q000472:pathogenicity*; D013045:Species Specificity
chemical_list: D015704:CD4 Antigens; D019713:Receptors, CCR5