Matter: Two Strains of H.I.V. Cut Vastly Different Paths

http://rss.nytimes.com/c/34625/f/640377/s/43f582e7/sc/14/l/0L0Snytimes0N0C20A150C0A30C0A20Cscience0Ctwo0Estrains0Eof0Ehiv0Ecut0Evastly0Edifferent0Epaths0Bhtml0Dpartner0Frss0Gemc0Frss/story01.htm

Researchers traced the origins of two subtypes of H.I.V.-1. One subtype stayed in Cameroon; the other spread throughout the world.

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