CMPNeu5Ac is an alias for the gene, Cytidine monophosphate N-acetylneuraminic acid synthetase, in humans. Other names include: N-acylneuraminate cytidylyltransferase; CMP-N-acetylneuraminic acid synthase; CMP-NeuNAc synthase; N-acylneuraminate cytidylyltransferase ; CMP-Neu5Ac synthetase; CSS. The encoded protein is an enzyme with an amino acid length of 434 and a mass of 48.4 kDa. CMPNeu5Ac is a member of the CMP-NeuNAc synthase family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Chicken.