Pis is an alias for the gene, CDP-diacylglycerol--inositol 3-phosphatidyltransferase, in humans. Other names include: Phosphatidylinositol synthase; PI synthase; PtdIns synthase; CDP-diacylglycerol-inositol 3-phosphatidyltransferase ; PIS; PIS1. The encoded protein is an enzyme with an amino acid length of 213 and a mass of 23.5 kDa. Other isoforms may exist. Pis is a member of the CDP-alcohol phosphatidyltransferase class-I family. This gene shares homology with other species, including: Yeast, Rat, Arabidopsis, Frog.