The ELISA kits listed below target CD81, the symbol for the human gene, CD81 molecule, and a member of the Tetraspanin (TM4SF) family. The protein encoded by CD81 has a predicted amino acid length of 236, a mass of 25.8 kDa, and a membrane subcellular localization. Pathologic involvement is reported in Immunodeficiency, common variable, 6. CD81 may also be known by the following names: S5.7, CVID6, tetraspanin-28, CD81 antigen (target of antiproliferative antibody 1), 26 kDa cell surface protein TAPA-1, and CD81 antigen, and TSPAN28. Orthologs of the gene, including human, mouse, rat, bovine, chicken, primate, guinea pig, plant, and other mammalian are available targets of several ELISA kits.