Evolutionary Conflict: HIV-Like Viruses and the Primate Immune System<img alt="" src="http://media-1.web.britannica.com/eb-media/29/117429-004-7A4C16AC.jpg" width="270" height="211" align="right" />Tracking down the evolutionary origin of HIV is an important part of AIDS research, particularly because of its potential to shed light on how the virus so effectively weakens the human immune system. That ability, it turns out, is the product of at least five million years of evolutionary conflict between HIV-related viruses and the primate genome.
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