Anti-SPAG9 antibodies are used in the immunodetection of the protein sperm associated antigen 9. In humans, the canonical protein has a reported length of 1321 amino acid residues and a mass of 146.2 kDa. Its subcellular localization is in the cytoplasmic vesicles, lysosomes and cytoplasm. Up to 6 different isoforms have been reported for this protein. It is found to be preferentially expressed in the testis on the round spermatids of stage I, II and II. A member of the JIP scaffold protein family, SPAG9 is known to be involved with neuronal differentiation and the regulation of cell migration. Synonyms for this target antigen include HLC-6, HLC4, HLC6, JIP-4, JIP4, JLP, PHET, and CT89. SPAG9 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species. A number of SPAG9 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA, Immunofluorescence, and Immunohistochemistry are also common applications.