an N-acylneuraminate + CTP = a CMP-N-acyl-beta-neuraminate + diphosphate
an n-acylneuraminate + ctp = a cmp-n-acyl-beta-neuraminate + diphosphate
"CMP-N-acetylneuraminic acid synthetase"
"cmp-n-acetylneuraminic acid synthetase"