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B4GALNT2, also named as GALGT2, catalyzes the last step in the biosynthesis of the human Sd(a) antigen, which is found on more than 90% of Caucasian red blood cells. It also catalyzes the last step in the biosynthesis of the Cad antigen, which is related both serologically and biochemically to the Sd(a) antigen. B4GALNT2 transfers a beta-1,4-linked GalNAc to the galactose residue of an alpha-2,3-sialylated chain. This antibody detects the 55-65 kDa B4GALNT2 protein.