Pseudaminic acid cytidylyltransferase (, PseF) is an enzyme with systematic name CTP:5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-alpha-L-manno-nonulosonic acid cytidylyltransferase. This enzyme catalyses the following chemical reaction
Mg<sup>2+</sup> is required for activity.