There are a number of ELISA Kits available for the measurement of KARP1, another term for the human protein, X-ray repair cross complementing 5. Other synonyms may include: X-ray repair cross-complementing protein 5, 86 kDa subunit of Ku antigen, ATP-dependent DNA helicase 2 subunit 2, ATP-dependent DNA helicase II 80 kDa subunit, CTC85, DNA repair protein XRCC5, and Ku autoantigen 80kDa. It is encoded by the XRCC5 gene to yield a protein 732 amino acids in length and 82.7 kDa in size. The protein is categorized into the Ku80 family. Versions of KARP1 are present in other organisms, including: Mouse, Rat, Fly, Arabidopsis, Zebrafish.