label: a beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->4)-beta-D-Glc-(1<->1)-Cer(d18:1(4E)) + UDP-alpha-D-galactose = a beta-D-Gal-(1->3)-beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->4)-beta-D-Glc-(1<->1')-Cer(d18:1(4E)) + UDP + H(+)
label_lc: a beta-d-glcnac-(1->3)-beta-d-gal-(1->4)-beta-d-glc-(1<->1)-cer(d18:1(4e)) + udp-alpha-d-galactose = a beta-d-gal-(1->3)-beta-d-glcnac-(1->3)-beta-d-gal-(1->4)-beta-d-glc-(1<->1')-cer(d18:1(4e)) + udp + h(+)