Reaction catalyzed by beta-N-acetylglucosaminylglycopeptide beta-1,4-galactosyltransferase (2.4.1.38)

		+			=			+
	UDP-glucose	+		4-methylumbelliferyl beta-D-xylopyranoside	=		UDP	+		4-O-beta-D-galactosyl-beta-D-glucose