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"Scientists at the Gladstone Institutes have discovered new protein fragments in semen that enhance the ability of HIV, the virus that causes AIDS, to infect new cells -- a discovery that one day could help curb the global spread of this deadly pathogen."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2011-12-scientists-human-proteins-fuel-hivaids.html>