a ganglioside GM1 (d18:1(4E)) + UDP-N-acetyl-alpha-D-galactosamine <=> a ganglioside GalNAc-GM1 (d18:1(4E)) + UDP + H(+)
a ganglioside gm1 (d18:1(4e)) + udp-n-acetyl-alpha-d-galactosamine <=> a ganglioside galnac-gm1 (d18:1(4e)) + udp + h(+)