Reaction catalyzed by mannosylglycoprotein endo-beta-mannosidase (3.2.1.152)

		=			+
	Manalpha(1-3)[Manalpha(1-6)]Manalpha(1-6)Manbeta(1-4)GlcNAcbeta(1-4)GlcNAc-pyridylaminoside	=		Manalpha(1-3)[Manalpha(1-6)]Manalpha(1-6)Man	+		GlcNAcbeta(1-4)GlcNAc-pyridylaminoside