Anti-SP9 antibodies are used in the immunodetection of the protein Sp9 transcription factor. In humans, the canonical protein has a reported length of 484 amino acid residues and a mass of 48.9 kDa. Its subcellular localization is in the nucleus. A member of the Sp1 C2H2-type zinc-finger protein family, Sp9 is known to be a transcription factor which plays a key role in limb development. Synonyms for this target antigen include Sp9 transcription factor homolog, zinc finger protein 990, and transcription factor Sp9. SP9 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some Sp9 antibodies may have been used in research and have associated citations. These antibodies are most commonly used in Western Blot experiments, among other applications.