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The Four Major Blood Groups Of The ABO System

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There are four major blood groups expressed by the ABO system. All individuals and many other primates can be categorized for the ABO blood group. First, the blood group A has A antigens on the red blood cells with anti-B antibodies in the plasma blood. Second, group B has B antigens with anti-A antibodies in the plasma blood. Next, group O develops no antigens but has together anti-A and anti-B antibodies in the plasma blood. For group AB, it has both A and B antigens but no antibodies.
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