Reaction catalyzed by keratan-sulfate endo-1,4-beta-galactosidase (3.2.1.103)

		+		H2O	=			+
	Gal(beta1-4)GlcNAc(beta1-3)Gal(beta1-4)sorbitol	+		H2O	=		Gal(beta1-4)GlcNAc(beta1-3)Gal	+		sorbitol