acetylgalactosaminyltransferase activity N-acetylneuraminylgalactosylglucosylceramide beta-1,4-N-acetylgalactosaminyltransferase activity https://github.com/geneontology/go-ontology/issues/18752 https://github.com/geneontology/go-ontology/issues/30193 RHEA:81971 EC:2.4.1.165 molecular_function MetaCyc:2.4.1.165-RXN RHEA:82011 UDP-N-acetyl-D-galactosamine:N-acetylneuraminyl-2,3-alpha-D-galactosyl-1,4-beta-D-glucosylceramide beta-1,4-N-acetylgalactosaminyltransferase activity RHEA:81947 uridine diphosphoacetylgalactosamine-acetylneuraminyl(alpha2->3)galactosyl(beta1->4)glucosyl beta1->4-acetylgalactosaminyltransferase activity RHEA:81955 GO:0047233 Catalysis of the reaction: an N-acetyl-alpha-neuraminyl-(2->3)-beta-D-galactosyl derivative + UDP-N-acetyl-alpha-D-galactosamine = an N-acetyl-beta-D-galactosaminyl-(1->4)-[N-acetyl-alpha-neuraminyl-(2->3)]-beta-D-galactosyl derivative + UDP + H+.