Ready-to-use ELISA kits are available for the detection of U2/Mu, an alias of the protein, copper metabolism domain containing 1. The official gene symbol is COMMD1. The kits can detect several species variants of the protein, including: human, bovine, and chicken. The protein, with a mass of 21.2 kDa and length of 190 residues, is reported to be cytoplasmic and nuclear. It may be known by other names, including: MURR1, protein Murr1, copper metabolism gene MURR1, copper metabolism (Murr1) domain containing 1, and COMM domain-containing protein 1.