label: an alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP + H(+) => a beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP-alpha-D-galactose
label_lc: an alpha-d-galactosyl-(1->3)-beta-d-galactosyl-(1->4)-n-acetyl-beta-d-glucosaminyl derivative + udp + h(+) => a beta-d-galactosyl-(1->4)-n-acetyl-beta-d-glucosaminyl derivative + udp-alpha-d-galactose