I have studied we all have different blood groups because of antigen , but if there is no antigen on O blood groups how there body make antibodies without antigen
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on the surface of RBCs., antigens are present.
A blood group has H-antigen + NAG
B blood group has H antigen and galactose
AB has H antigen and N-acetyl galactosamine + Galactose
suppose somebody got covid....then what does it's body produce antibodies right??
similarly when the blood transfusion occurs, as O has no antigen so it would produce the antibodies otherwise those A, B, AB blood group would destroy the RBCs of the person having the O blood group.
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