Anti-M-PST antibodies are protein reagents that detect specific antigens. The M-PST antigen is another term for the human protein sulfotransferase family 1A member 3, encoded by the SULT1A3 gene. The protein is a reported sulfotransferase that utilizes 3'-phospho-5'-adenylyl sulfate (PAPS) as sulfonate donor to catalyze the sulfate conjugation of phenolic monoamines (neurotransmitters such as dopamine, norepinephrine and serotonin) and phenolic and catechol drugs. Canonically, it has an amino acid length of 295 residues and a mass of 34.2 kilodaltons. Its subcellular localization is in the cytoplasm and it is expressed in the small intestine, rectum, duodenum, colon, and appendix. The M-PST protein is a member of the Sulfotransferase 1 protein family.