Reaction catalyzed by beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,6-N-acetylglucosaminyltransferase (2.4.1.102), beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,3-N-acetylglucosaminyltransferase (2.4.1.146)

		+			=			+
	UDP-N-acetyl-D-glucosamine	+		beta-D-galactosyl-1,3-N-acetyl-D-galactosaminyl-R	=		UDP	+		beta-D-galactosyl-1,3-(N-acetyl-beta-D-glucosaminyl-1,6)-N-acetyl-D-galactosaminyl-R