Reaction catalyzed by acetylgalactosaminyl-O-glycosyl-glycoprotein beta-1,6-N-acetylglucosaminyltransferase (2.4.1.148)

		+			=			+
	UDP-N-acetyl-D-glucosamine	+		N-acetyl-beta-D-glucosaminyl-(1->3)-N-acetyl-D-galactosaminyl-R	=		UDP	+		N-acetyl-beta-D-glucosaminyl-(1->6)-[N-acetyl-beta-D-glucosaminyl-(1->3)]-N-acetyl-D-galactosaminyl-R