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Each blood type has it's identifying proteins, and will reject blood with the wrong proteins. Type A blood is anti-B, type B blood is anti-A, type O blood has both, and type AB blood has neither. Imagine if someone with AB blood tried to donate to someone with A. AB blood has identifying proteins A and B. The type A blood would recognize the B proteins and kill the cells. The same thing would happen with B, which would recognize the A proteins and kill the cells. Type O blood would recognize and reject both the A and B proteins and reject them. However, if someone who is type AB gives to AB people, their blood does not destroy neither protein A nor B, so it would accept it.

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Reynold Berge

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3y ago

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