Reaction catalyzed by glycoprotein-fucosylgalactoside alpha-N-acetylgalactosaminyltransferase (2.4.1.40)

		+			=			+
	UDP-N-acetyl-D-galactosamine	+		L-fucosyl-alpha-1,2-beta-galactosyl-O(CH2)7CH3	=		UDP	+		alpha-D-galactosaminyl-1,3-[alpha-L-fucosyl-1,2]-beta-D-galactosyl-O(CH2)7CH3