Description_x000D_ Application_x000D_ S9 from Liver, Pooled has been used in metabolic activation in Salmonella typhimurium strains._x000D_ Biochem/physiol Actions_x000D_ The hepatic S9 pools from a variety of biological sources represent the post-mitochondrial supernatant fraction from homogenized liver. Known to be a rich source of drug metabolizing enzymes including P-450, these pools are useful in the study of xenobiotic metabolism and drug interactions._x000D_ They are used in the Ames test, which is a method that uses bacteria to test if a given chemical causes mutations in the genetic material of a given test organism.