label: a beta-D-Gal-(1->4)-beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->4)-beta-D-GlcNAc derivative + UDP-N-acetyl-alpha-D-glucosamine = a beta-D-Gal-(1->4)-beta-D-GlcNAc-(1->3)-[beta-D-GlcNAc-(1->6)]-beta-D-Gal-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP + H(+)
label_lc: a beta-d-gal-(1->4)-beta-d-glcnac-(1->3)-beta-d-gal-(1->4)-beta-d-glcnac derivative + udp-n-acetyl-alpha-d-glucosamine = a beta-d-gal-(1->4)-beta-d-glcnac-(1->3)-[beta-d-glcnac-(1->6)]-beta-d-gal-(1->4)-n-acetyl-beta-d-glucosaminyl derivative + udp + h(+)