In this lecture I'd like to focus on the other region, the f one region because it's the f one region that contains the catalytic structure. The catalytic structure is known as the alpha three beta three hexamurine. So the f one region of ATP synthase contains that hexamurine, the alpha three beta three structure that actually catalyzes the formation of ATP molecules. And it does this in three different steps. So in step one it basically binds the reactants, the ATP molecules and the inorganic orthophosphate molecules. In step two it actually catalyzed their combination to form the product molecule, the ATP.