Anti-RP9 antibodies are used in the immunodetection of the protein RP9 pre-mRNA splicing factor. In humans, the canonical protein has a reported length of 221 amino acid residues and a mass of 26.1 kDa. Its subcellular localization is in the nucleus. RP9 is known to be involved with RNA splicing. The RP9 gene has been associated with the disease, Retinitis pigmentosa. Synonyms for this target antigen include PAP1, Pim-1 kinase associated protein, pim-1-associated protein, retinitis pigmentosa 9 (autosomal dominant), and PAP-1. RP9 gene orthologs have been reported in the mouse, rat, frog, zebrafish and chicken species. Some RP9 antibodies may have been used in research and have associated citations. These antibodies are most commonly used in Western Blot experiments, among other applications.