EPT1 is a symbol for the gene, Ethanolaminephosphotransferase 1, in humans. Other names include: hEPT1; Selenoprotein I; SelI; SEPI; ethanolaminephosphotransferase 1 (CDP-ethanolamine-specific). The encoded protein is an enzyme with an amino acid length of 397 and a mass of 45.2 kDa. Other isoforms may exist. EPT1 is a member of the CDP-alcohol phosphatidyltransferase class-I family. This gene shares homology with other species, including: Mouse, Chicken.