. "Catalysis of the reaction: UDP-N-acetyl-D-glucosamine + protein = UDP + 4-N-(N-acetyl-D-glucosaminyl)-protein." . . "protein N-acetylglucosaminyltransferase activity" . "N-GlcNAc transferase activity" . "UDP-N-acetyl-D-glucosamine:protein beta-N-acetyl-D-glucosaminyl-transferase activity" . "UDP-N-acetylglucosamine-peptide N-acetylglucosaminyltransferase activity" . "uridine diphospho-N-acetylglucosamine:polypeptide beta-N-acetylglucosaminyltransferase activity" . "uridine diphosphoacetylglucosamine-protein acetylglucosaminyltransferase activity" . . . .