Inside the Blood Factory That Keeps Track of the World's Rare Donors

When most of us think of "rare blood," we think of Type O-negative. But it turns out there are far, far rarer types than that. In Filton, England, there's a lab that handles blood donations from across the UK—and identifies this super-rare blood.

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via Gizmodo http://ift.tt/1yPe4vJ