Blood Types:
Also called the Landsteiner classification, the ABO blood groups classify blood into four types, A, B, AB, and O, and recognizes which blood groups can be safely mixed. Type O blood can give to all blood types, but can receive only from type O. AB blood type can give to only AB, but can receive from any group. Thus type O is sometimes called the universal donor and type AB the universal recipient. Type A can give to types A and AB and receive only from types A and O, and type B can give to types B and AB, and receive only from type B or O.
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