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Pathology
Although more than 400 blood groups have been identified, the ABO blood group system remians the most impoant in clinical medicne because ?
It was the first blood group system to be discovered -
It has four different blood groups A,B, AB, 0 (H).
ABO(H) antigens are present in most body tissues and fluids
ABO(H) antibodies are invariably present in plasma when persons RBC lacks the corresponding antigen
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