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

		+			=			+
	GDP-fucose	+		Gal-beta-1,4GlcNAc-beta-1-R	=		GDP	+		Gal-beta-1,4(fuc-alpha-1,3)GlcNAc-beta-1-R