Anti-MST antibodies enable researchers to detect and measure the MST antigen in biological samples. This target is a reported synonym of the MPST gene, which encodes mercaptopyruvate sulfurtransferase. This protein is known to function in kidney development and liver development, among other biological roles. The human version of MST has a canonical amino acid length of 297 residues and a protein mass of 33.2 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the mitochondria and cytoplasm of cells and widely expressed in many tissue types.