ID 2.4.1.149 DE N-acetyllactosaminide beta-1,3-N-acetylglucosaminyltransferase. AN beta-galactosyl-N-acetylglucosaminylgalactosylglucosyl-ceramide beta-1,3- AN acetylglucosaminyltransferase. AN GnTE. AN poly-N-acetyllactosamine extension enzyme. CA a beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP- CA N-acetyl-alpha-D-glucosamine = an N-acetyl-beta-D-glucosaminyl-(1->3)- CA beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + H(+) + CA UDP. CC -!- Acts on beta-galactosyl-1,4-N-acetylglucosaminyl termini on CC glycoproteins, glycolipids, and oligosaccharides. CC -!- Formerly EC 2.4.1.163. DR Q9NY97, B3GN2_HUMAN; Q9Z222, B3GN2_MOUSE; Q9Y2A9, B3GN3_HUMAN; DR Q5JCS9, B3GN3_MOUSE; Q9C0J1, B3GN4_HUMAN; Q1RLK6, B3GN4_MOUSE; //