Anti-POLR2K antibodies are used in the immunodetection of the protein RNA polymerase II, I and III subunit K. 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, POLR2K is known to be involved with transcription by RNA polymerase II. Synonyms for this target antigen include RPABC4, RPB10alpha, RPB12, RPB7.0, hRPB7.0, and ABC10-alpha. POLR2K gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.