Reaction catalyzed by 3-galactosyl-N-acetylglucosaminide 4-alpha-L-fucosyltransferase (2.4.1.65)

		+			=			+
	GDP-beta-L-fucose	+		beta-D-galactosyl-(1->3)-N-acetyl-D-glucosaminyl-R	=		GDP	+		beta-D-galactosyl-(1->3)-[alpha-L-fucosyl-(1->4)]-N-acetyl-beta-D-glucosaminyl-R