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How can o positive have antibodies a and b without antigens? |
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Answer» There are FOUR main blood GROUPS DEFINED by the ABO system: blood group A – has A antigens on the red blood CELLS with anti-B antibodies in the plasma. ... blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma. blood group AB – has both A and B antigens, but no antibodies. |
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