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Applying a Molecular Clock: The Origin of HIV• Phylogenetic analysis shows that HIV isdescended from viruses that infectchimpanzees and other primates• Comparison of HIV samples throughout theepidemic shows that the virus evolved in a veryclocklike way• Application of a molecular clock to one strain ofHIV suggests that that strain spread to humansduring the 1930sCopyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings