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

		+		H2O	=			+
	Man9GlcNAc2-[protein]	+		H2O	=		Man8GlcNAc2-[protein] (isomer 8A1,2,3B1,2)	+		beta-D-mannopyranose