Viral evolution. Not such a variable clock?
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D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology; D001683:Biological Clocks; D005075:Biological Evolution; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D010802:Phylogeny; D012328:RNA Viruses / Q000235:genetics*; D013995:Time