. . . "Sialyltransferase" . "Neolactotetraosylceramide alpha-2,3-sialyltransferase" . "CMP-N-acetylneuraminate + beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-(1->3)-beta-D-galactosyl-(1->4)-D-glucosyl-(1<->1)-ceramide = CMP + alpha-N-acetylneuraminyl-(2->3)-beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-(1->3)-beta-D-galactosyl-(1->4)-D-glucosyl-(1<->1)-ceramide." .