Reaction catalyzed by beta-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase (2.4.1.144)

		+		transferrin	=			+		transferrin with bisecting N-acetyl-D-glucosamine
	UDP-N-acetyl-D-glucosamine	+		transferrin	=		UDP	+		transferrin with bisecting N-acetyl-D-glucosamine