Tetrasaccharides, having blood group A and B activities, were obtained from A and B substances, respectively. When the A-active tetrasaccharide was acted on by α-
N-acetylgalactosaminidase from hog liver and the B-active tetrasaccharide by α-galactosidase from
Cl. sprogenes Maebashi,
N-acetylgalactosamine and galactose were liberated from these sugars, respectively, and they turned into trisaccharides having H activity.
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