Anti-LIRF antibodies enable researchers to detect and measure the LIRF antigen in biological samples. This target is a reported synonym of the RNF39 gene, which encodes ring finger protein 39. This protein is known to function in protein ubiquitination, among other biological roles. The human version of LIRF has a canonical amino acid length of 420 residues and a protein mass of 45.5 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasm of cells.