Red blood cells. Via Wikipedia.

Why Do We Have Blood Types?

ByCarl Zimmer
July 15, 2014

Knowing your blood types can be a matter of life and death. So you might think that scientists had a clear idea of why we have them in the first place. I’ve written a feature for Mosaic, a new online magazine about medicine, in which I try to get the answer. It proves a lot harder than I expected. Check it out.

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