?:definition
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Catalysis of the reaction: N-acetylneuraminyl-2,3-alpha-D-galactosyl-1,4-beta-D-glucosylceramide + UDP-N-acetylgalactosamine = N-acetyl-beta-D-galactosaminyl-1,4-(N-acetyl-alpha-neuraminyl-2,3)-beta-D-galactosyl-1,4-beta-D-glucosylceramide + UDP. [EC:2.4.1.165, MetaCyc:2.4.1.165-RXN]
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