Anti-HAP1 antibodies are used in the immunodetection of the protein huntingtin associated protein 1. In humans, the canonical protein has a reported length of 671 amino acid residues and a mass of 75.5 kDa. Its subcellular localization is in the cytoplasm. Up to 4 different isoforms have been reported for this protein. It is reported to be highly expressed in the brain. HAP1 is known to be involved with autophagy pathways and brain development. Synonyms for this target antigen include HIP5, HLP, hHLP1, epididymis secretory sperm binding protein, huntingtin-associated protein 2, neuroan 1, and HAP2. HAP1 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species. A number of Hap1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.