label: 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 + UDP + H(+)
label_lc: 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 + udp + h(+)