Reaction catalyzed by UDP-Gal:alpha-L-Fuc-1,2-beta-Gal-1,3-alpha-GalNAc-1,3-alpha-GalNAc-diphosphoundecaprenol alpha-1,3-galactosyltransferase (2.4.1.309)

		+			=
	UDP-alpha-D-galactose	+		beta-D-Gal-(1->3)-alpha-D-GalNAc-OMe	=		alpha-D-Gal-(1->3)-beta-D-Gal-(1->3)-alpha-D-GalNAc-OMe