. "Catalysis of the reaction: UDP-N-acetyl-D-galactosamine + N-acetyl-beta-D-glucosaminyl group = UDP + N-acetyl-beta-D-galactosaminyl-(1->4)-N-acetyl-beta-D-glucosaminyl group." . . "beta4GalNAc-T4" . "beta4GalNAc-T3" . "N-acetyl-beta-glucosaminyl-glycoprotein 4-beta-N-acetylgalactosaminyltransferase activity" . "beta1,4-N-acetylgalactosaminyltransferase activity" . "beta1,4-N-acetylgalactosaminyltransferase III activity" . "beta1,4-N-acetylgalactosaminyltransferase IV activity" . "UDP-N-acetyl-D-galactosamine:N-acetyl-D-glucosaminyl-group beta-1,4-N-acetylgalactosaminyltransferase activity" . . .