Reaction catalyzed by 1,4-beta-mannosyl-N-acetylglucosamine phosphorylase (2.4.1.320)

		+			=			+
	4-O-beta-D-mannopyranosyl-N-acetyl-D-glucosamine	+		phosphate	=		N-acetyl-D-glucosamine	+		alpha-D-mannose 1-phosphate