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Why do we have blood types?

Why do we have blood types?

BBC Future - Carl Zimmer

More than a century after their discovery, we still don’t know what blood groups like O, A and B are for. Do they really matter? Carl Zimmer investigates. When my parents informed me that my blood type was A+, I felt a strange sense of pride. If A+ was the top grade in school, then surely A+ was …

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