Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 9002-10-2, Whether you call it Tyrosinase, Catechol Oxidase , Monophenol - Dihydroxyphenylalanine:Oxygen Oxidoreductase , Monophenol Monooxygenase or Polyphenol Oxidase you can be assured the Tyrosinase products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.