Anti-TSPAN31 antibodies are used in the immunodetection of the protein tetraspanin 31. In humans, the canonical protein has a reported length of 210 amino acid residues and a mass of 23.1 kDa. Its subcellular localization is in the membrane. It is notably expressed in many tissues, such as the bronchus, urinary bladder, and adrenal gland. A member of the Tetraspanin (TM4SF) protein family, TSPAN31 is known to be involved with the regulation of cell proliferation. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include sarcoma-amplified sequence, transmembrane 4 protein, and SAS. TSPAN31 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish and chimpanzee species. Some TSPAN31 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, ELISA is also a common application.