CK26, or Keratin 26, type I, is a human gene encoded by KRT26. It may also be known as: Keratin, type I cytoskeletal 26; Cytokeratin-26; CK-26; Keratin-25B; K25B; Keratin-26; K26; Type I inner root sheath-specific keratin-K25irs2; K25IRS2; KRT25B. The encoded protein has an amino acid length of 468 and a mass of 51.9 kDa. Other isoforms may exist. CK26 is a member of the Intermediate filament family. Homologs of this gene exist in other organisms, including: Mouse, Rat.