Ready-to-use ELISA kits are available for the detection of Xox1, an alias of the protein, xanthine dehydrogenase. The official gene symbol is XDH. The protein, with a mass of 146.4 kDa and length of 1333 residues, is reported to be cytoplasmic and secreted. It is a member of the Xanthine dehydrogenase family and may be known by other names, including: XO, XAN1, xanthine oxidoreductase, and xanthine dehydrogenase/oxidase.