Provided below are ELISA kits targeting NDUFA4 mitochondrial complex associated, a human protein encoded by NDUFA4. This protein is 81 amino acids long, with a mass of 9.4 kDa, and is a member of the Complex IV NDUFA4 subunit family. This is reported to be a mitochondrial protein. There is a noted implication in Leigh syndrome. Other alias names for this protein include: cytochrome c oxidase subunit NDUFA4, Complex I 9kDa subunit, NADH dehydrogenase (ubiquinone) 1 alpha subcomplex 4 9kDa, NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 4, complex I-MLRQ, cytochrome c oxidase subunit FA4, and CI-9k.