Anti-CAIV antibodies enable researchers to detect and measure the CAIV antigen in biological samples. This target is a reported synonym of the CA4 gene, which encodes carbonic anhydrase 4. This protein is known to catalyze the reversible hydration of carbon dioxide into bicarbonate and protons and thus is essential to maintaining intracellular and extracellular pH. The human version of CAIV has a canonical amino acid length of 312 residues and a protein mass of 35 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cell membrane of cells and notably expressed in the rectum, gallbladder, colon, cerebral cortex, and appendix. Other names for this target antigen include Car4 and RP17. Western Blot is the most common application for the CAIV antibodies listed below. ELISA and Immunohistochemistry are also common applications.