Anti-HYDIN antibodies are used in the immunodetection of the protein HYDIN axonemal central pair apparatus protein. In humans, the canonical protein has a reported length of 5121 amino acid residues and a mass of 575.9 kDa. Its subcellular localization is in the cell projections and cytoplasm. Up to 6 different isoforms have been reported for this protein. It is notably expressed in the testis, fallopian tube, and endometrium. HYDIN is known to be required for ciliary motility. The HYDIN gene has been associated with the disease, Ciliary dyskinesia. Synonyms for this target antigen include HYDIN1, HYDIN2, PPP1R31, hydrocephalus-inducing protein homolog, protein phosphatase 1, regulatory subunit 31, and CILD5. HYDIN gene orthologs have been reported in the mouse, rat, frog, zebrafish, chimpanzee and chicken species. Some HYDIN antibodies may have been used in research and have associated citations. These antibodies are most commonly used in ELISA experiments, among other applications.