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        HIV Immunity

        Excerpted from NOVA: Surviving AIDS, this video segment showcases the work of Drs. David Ho and Stephen O'Brien. By examining the "outliers" -- in this case, people like Steve Crohn, whose cells repeatedly resisted HIV infection -- Ho and his colleagues found a genetic mutation that prevents the HIV virus from entering the cell. This video segment includes animation of HIV entering a white blood cell through the CD-4 and CCR-5 receptors on the cell's surface. Some individuals have no CCR-5 gene, which means that HIV cannot enter their cells. Scientists are using this new information in the development of an AIDS treatment.

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