Attaches N-acetylneuraminic acid in alpha-2,6-linkage to N-acetyl-galactosamine only when present in the structure of alpha-N-acetyl-neuraminyl-(2->3)-beta-galactosyl-(1->3)-N-acetylgalactosaminyl-R, where R may be protein or p-nitrophenol.
Source:http://purl.uniprot.org/enzyme/2.4.99.7
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