Reaction catalyzed by polypeptide N-acetylgalactosaminyltransferase (2.4.1.41)

		+			=			+
	UDP-GalNAc	+		N-acetyl-4-benzoyl-L-Phe-L-Pro-L-Tyr-L-Pro-L-Pro-L-Pro-NH2	=		UDP	+		N-acetyl-4-benzoyl-L-Phe-L-Pro-L-(GalNAcalpha1-)Tyr-L-Pro-L-Pro-L-Pro-NH2