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Blood group antigens are biochemical markers found on the surface of red blood cells that determine an individual’s blood type. These antigens are primarily glycoproteins or glycolipids, where sugar molecules are attached to a protein or lipid backbone. The most well-known blood group systems are the ABO system and the Rh system. In the ABO system, the antigens are A and B, which differ in the ____ _________ _______ _________ _________ ____ ______ _________ _______.
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