There are a number of ELISA Kits available for the measurement of Ka36, another term for the human protein, keratin 40. Other synonyms may include: keratin type I cytoskeletal 40, cytokeratin-40, keratin 40 type I, type I hair keratin KA36, K40, and KA36. It is encoded by the KRT40 gene to yield a protein 431 amino acids in length and 48.1 kDa in size. The protein is categorized into the Intermediate filament family. Versions of Ka36 are present in other organisms, including: Mouse, Rat.