Anti-Rfg antibodies enable researchers to detect and measure the Rfg antigen in biological samples. This target is a reported synonym of the NCOA4 gene, which encodes nuclear receptor coactivator 4. This protein is known to function in male gonad development, among other biological roles. The human version of Rfg has a canonical amino acid length of 614 residues and a protein mass of 69.7 kilodaltons, although 4 isoforms have been identified. Other names for this target antigen include ARA70, ARA70, and ELE1.