Anti-RNA polymerase II, I and III subunit K antibodies are used for the immunodetection of the protein encoded by the POLR2K gene. In humans, the canonical protein has a reported length of 58 amino acid residues and a mass of 7 kDa. Its subcellular localization is in the nucleus. A member of the Archaeal Rpo12/eukaryotic RPC10 RNA polymerase subunit protein family, it is known to be involved with transcription by RNA polymerase II. Other names for this target antigen include RPABC4, RPB10alpha, RPB12, RPB7.0, hRPB7.0, and ABC10-alpha. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.