Anti-Carbonic Anhydrase XII antibodies enable researchers to detect and measure the Carbonic Anhydrase XII antigen in biological samples. This target is a reported synonym of the CA12 gene, which encodes carbonic anhydrase 12. The human version of Carbonic Anhydrase XII has a canonical amino acid length of 354 residues and a protein mass of 39.5 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cell membrane of cells and notably expressed in many tissues, such as the appendix and colon. Other names for this target antigen include CA-XII, CA-XII, and CAXII.