Anti-STM antibodies enable researchers to detect and measure the STM antigen in biological samples. This target is a reported synonym of the SULT1A3 gene, which encodes sulfotransferase family 1A member 3. This protein is known to function in metabolic processes, among other biological roles. The human version of STM has a canonical amino acid length of 295 residues and a protein mass of 34.2 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasm of cells and notably expressed in the small intestine, rectum, duodenum, colon, and appendix. Other names for this target antigen include HAST, HAST3, and M-PST. Indicated applications for STM antibodies listed below include ELISA and Western Blot.