Reaction catalyzed by UDP-GalNAc:alpha-D-GalNAc-diphosphoundecaprenol alpha-1,3-N-acetylgalactosaminyltransferase (2.4.1.306)

		+			=			+
	UDP-N-acetyl-alpha-D-galactosamine	+		N-acetyl-alpha-D-galactosaminyl-diphospho-11-phenoxyundecanol	=		UDP	+		alpha-D-GalNAc-(1->3)-alpha-D-GalNAc-diphospho-11-phenoxyundecanol