Blood groups

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Blood group substance

blood group-specific substances a and B, solution of complexes of polysaccharides and amino acids that reduces the titre of anti-a and anti-B isoagglutinins in serum from group O persons; used to render group O blood reasonably safe for transfusion into persons of group A, B, or ab, but does not affect any incompatibility that results from various other factors, such as rH.