CK12 is an alias for the gene, Keratin 12, type I, in humans. Other names include: Keratin, type I cytoskeletal 12; Cytokeratin-12; CK-12; Keratin-12; K12; Meesmann corneal dystrophy. The encoded protein has an amino acid length of 494 and a mass of 53.5 kDa. Other isoforms may exist. CK12 is a member of the Intermediate filament family. This gene shares homology with other species, including: Mouse.