So what exactly are these four steps? Well, step one is the oxidation step. It's an oxidation by specific type of molecule we call Fad, where Fad stands for Flavin adenine dinucleotide. The second step is a hydration step. The third step is another oxidation step, but now it is oxidized by NAD Plus. And the final step is a thiolytic cleavage bico enzyme, a molecule.