AC133, or Prominin 1, is a human gene encoded by PROM1. It may also be known as: Prominin-1; Prominin-like protein 1; CD antigen CD133; Antigen AC133; CD133; CORD12; MCDR2; MSTP061; PROML1; RP41; STGD4. The encoded protein has an amino acid length of 865 and a mass of 97.2 kDa. AC133 is a member of the Prominin family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog.