Anti-POLR2D antibodies are used in the immunodetection of the protein RNA polymerase II subunit D. In humans, the canonical protein has a reported length of 142 amino acid residues and a mass of 16.3 kDa. Its subcellular localization is in the nucleus. It is notably widely expressed in many tissue types. A member of the Eukaryotic RPB4 RNA polymerase subunit protein family, POLR2D is known to be involved with transcription by RNA polymerase II. Synonyms for this target antigen include HSRPB4, RBP4, RPB16, RPB4, DNA-directed RNA polymerase II subunit RPB4, and HSRBP4. POLR2D gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some POLR2D antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.