There are a number of ELISA Kits available for the measurement of Ka13, another term for the human protein, keratin 13. Other synonyms may include: keratin type I cytoskeletal 13, CK-13, cytokeratin 13, keratin 13 type I, K13, and WSN2. It is encoded by the KRT13 gene to yield a protein 458 amino acids in length and 49.6 kDa in size. However, there are up to 3 reported isoforms. The protein is categorized into the Intermediate filament family. Versions of Ka13 are present in other organisms, including: Mouse, Rat.