Reaction catalyzed by N-acetylgalactosaminide beta-1,3-galactosyltransferase (2.4.1.122)

		+			=			+
	UDP-alpha-D-galactose	+		N-acetyl-alpha-D-galactosaminyl-R	=		UDP	+		beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl-R