Wired's brief explanation of what scientists at UPenn may have discovered. The site will link you to the full report as well.
From Wired:
Back in the 1990's, researchers took interest in a handful of promiscuous gay men who were able to engage in sexual relations with their HIV-positive partners with impunity. Most of them had a mutation that kept their cells from producing normal CCR5 protein.
Armed with that knowledge, scientists have developed several tactics to block the production of CCR5 or perturb its shape so that the HIV virus can't grab onto it during the first step of its hijacking attempt. The strategy is much akin to cutting your hair before a wrestling match: It gives your opponent one less thing to grab onto.
Image and link via Wired.com
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