Anti-polymerase (RNA) II subunit J antibodies enable researchers to detect and measure the polymerase (RNA) II subunit J antigen in biological samples. This target is a reported synonym of the POLR2J gene, which encodes RNA polymerase II subunit J. This protein is known to function in transcription by RNA polymerase II, among other biological roles. The human version of polymerase (RNA) II subunit J has a canonical amino acid length of 117 residues and a protein mass of 13.3 kilodaltons. It is reported to be localized in the nucleus of cells. polymerase (RNA) II subunit J is a member of the Archaeal Rpo11/eukaryotic RPB11/RPC19 RNA polymerase subunit protein family.