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Blood types are not just a genetic curiosity—they have lifesaving implications, particularly in medical settings like blood transfusions. When someone receives blood, matching the correct type is crucial. An incompatible transfusion can cause the recipient’s immune system to react adversely, leading to potential clotting and severe complications.
Type AB blood, which carries both A and B antigens, is considered universal for donations, as individuals with this type do not produce antibodies against either antigen. Conversely, those with type O blood, lacking both antigens, are universal donors. However, individuals with type O blood produce antibodies against A and B antigens, rejecting any received blood that is not also type O.