X-PS-beta is an alias for the gene, Presenilin 1, in humans. Other names include: Presenilin-1; Protein S182; PS-1; AD3; FAD; S182. The encoded protein is an enzyme with an amino acid length of 467 and a mass of 52.7 kDa. Other isoforms may exist. X-PS-beta is a member of the Peptidase A22A family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.