Keratin 18 is an alias for the gene, Keratin 18, type I, in humans. Other names include: Keratin, type I cytoskeletal 18; Cell proliferation-inducing gene 46 protein; Cytokeratin-18; CK-18; Keratin-18; K18; CYK18. The encoded protein has an amino acid length of 430 and a mass of 48.1 kDa. Keratin 18 is a member of the Intermediate filament family. This gene shares homology with other species, including: Mouse, Zebrafish.