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The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Galactose and ABO Antigen Precursor Substance

Specific sugars attached to the red cell membrane in unvarying linkage conformations determine ABO antigenic activity. Galactose resides at the end of this specific sugar chain. This configuration constitutes the ABO antigen precursor substance.