Reaction catalyzed by mannosyl-oligosaccharide 1,2-alpha-mannosidase (3.2.1.113)

		+		H2O	=			+
	Man7GlcNAc2-[protein] (isomer 7A1,2,3B2)	+		H2O	=		Man6GlcNAc2-[protein] (isomer 6A1,2B2)	+		beta-D-mannopyranose