Abstract
Molecular evolutionary analyses strongly support the hypothesis that human immunodeficiency viruses have recently arisen from a diverse pool of nonhuman primate immunodeficiency viruses. Our understanding of the molecular phylogenetic relationships between primate and nonprimate lentiviruses is less certain, partly because key intermediate forms are still to be discovered. DNA and protein sequence comparisons reveal uncanny dissimilarities, as well as similarities, among the genetic sequences of these complex retroviruses, thereby giving rise to the notion that primate lentiviruses are participants in "fast-forward" evolution.
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