Anti-AP4E1 antibodies are used in the immunodetection of the protein adaptor related protein complex 4 subunit epsilon 1. In humans, the canonical protein has a reported length of 1137 amino acid residues and a mass of 127.3 kDa. Its subcellular localization is in the Golgi and membrane. Up to 2 different isoforms have been reported for this protein. It is widely expressed across many tissue types. A member of the Adaptor complexes large subunit protein family, AP4E1 is a known component of the adaptor protein complex 4 (AP-4). Synonyms for this target antigen include SPG51, STUT1, AP-4 complex subunit epsilon-1, AP-4 adaptor complex subunit epsilon, adaptor related protein complex 4 epsilon 1 subunit, and CPSQ4. AP4E1 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some AP4E1 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.