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