Reaction catalyzed by N-acetyllactosaminide 3-alpha-galactosyltransferase (2.4.1.87)

		+			=			+
	UDP-galactose	+		beta-D-galactosyl-1,4-N-acetyl-D-glucosamine	=		UDP	+		alpha-D-galactosyl-1,3-beta-D-galactosyl-1,4-N-acetyl-D-glucosamine