Anti-AP4B1 antibodies are used in the immunodetection of the protein adaptor related protein complex 4 subunit beta 1. In humans, the canonical protein has a reported length of 739 amino acid residues and a mass of 83.3 kDa. Its subcellular localization is in the golgi and membrane. Alternative splicing is reported to yield 2 different isoforms for this protein. It is widely expressed across many tissue types. A member of a the Adaptor complexes large subunit protein family, AP4B1 is a known component of the adaptor protein complex 4 (AP-4). Synonyms for this target antigen include CPSQ5, SPG47, AP-4 complex subunit beta-1, AP-4 adaptor complex subunit beta, adaptor related protein complex 4 beta 1 subunit, and BETA-4.