Anti-RSPH9 antibodies are used in the immunodetection of the protein radial spoke head component 9. In humans, the canonical protein has a reported length of 276 amino acid residues and a mass of 31.3 kDa. Its subcellular localization is in the cytoplasm. Up to 2 different isoforms have been reported for this protein. It is notably expressed in the testis, nasopharynx, fallopian tube, endometrium, and bronchus. A member of the Flagellar radial spoke RSP9 protein family, RSPH9 is known to functions as part of axonemal radial spoke complexes that play an important part in the motility of sperm and cilia. The RSPH9 gene has been associated with the disease, Ciliary dyskinesia. Synonyms for this target antigen include radial spoke head protein 9 homolog and radial spoke head 9 homolog. RSPH9 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of RSPH9 antibodies have been mentioned in research publications and have associated citations. These antibodies are most commonly used in Western Blot experiments, among other applications.