what is blood group A lacks
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The blood group system is characterised by the presence of the antigens on the surface of the red blood cells and the antibodies in the plasma. Person with blood group AB have both A and B antigens on the membrane of the RBC but lacks antibodies a and b in his plasma.
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answer as follows
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Group A has only A antigen, group B carries B antigen, and group AB has both A and B antigens on the RBCs. Group O has neither A nor B antigen, but group O individuals have H antigen, which is the precursor substrate for A and B antigens.
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