Ready-to-use ELISA kits are available for the detection of ring finger 111, an alias of the protein, ring finger protein 111. The official gene symbol is RNF111. The protein, with a mass of 108.9 kDa and length of 994 residues, is reported to be cytoplasmic and nuclear. It is a member of the Arkadia family and may be known by other names, including: ARK, RING-type E3 ubiquitin transferase Arkadia, Arkadia, and E3 ubiquitin-protein ligase Arkadia.