a beta-D-Gal-(1->4)-beta-D-Glc-(1<->1)-Cer(d18:1(4E)) + CMP-N-acetyl-beta-neuraminate => a ganglioside GM3 (d18:1(4E)) + CMP + H(+)
a beta-d-gal-(1->4)-beta-d-glc-(1<->1)-cer(d18:1(4e)) + cmp-n-acetyl-beta-neuraminate => a ganglioside gm3 (d18:1(4e)) + cmp + h(+)