acetylglucosaminyltransferase activity N-acetyllactosaminide beta-1,3-N-acetylglucosaminyltransferase activity https://github.com/geneontology/go-ontology/issues/28199 https://github.com/geneontology/go-ontology/issues/28526 uridine diphosphoacetylglucosamine-acetyllactosaminide beta1->3-acetylglucosaminyltransferase Reactome:R-HSA-2025724 molecular_function RHEA:82955 UDP-N-acetyl-D-glucosamine:beta-D-galactosyl-1,4-N-acetyl-D-glucosamine beta-1,3-acetyl-D-glucosaminyltransferase activity UDP-GlcNAc:Galbeta-1,4-GlcNAcbeta-beta-1,3-N-acetylglucosaminyltransferase activity Catalysis of the reaction: a beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP-N-acetyl-alpha-D-glucosamine = an N-acetyl-beta-D-glucosaminyl-(1->3)-beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + H+ + UDP. GO:0008532 RHEA:82971 uridine diphosphoacetylglucosamine-acetyllactosaminide beta-1,3-acetylglucosaminyltransferase RHEA:14389 MetaCyc:2.4.1.163-RXN poly-N-acetyllactosamine extension enzyme activity Reactome:R-HSA-9931297 UDP-GlcNAc:GalR, beta-D-3-N-acetylglucosaminyltransferase activity GnTE activity N-acetyllactosamine beta(1,3)N-acetylglucosaminyltransferase activity MetaCyc:2.4.1.149-RXN EC:2.4.1.149 UDP-GlcNAc:Galbeta-(1,4)-GlcNAcbeta-r-beta-(1,3)-N-acetylglucosaminyltransferase activity galbeta1->4GlcNAc-R beta1->3 N-acetylglucosaminyltransferase activity