So once again, it's the movement of these hydrogen ions through the half channels of the f zero region that allows the rotation of the searing and that intern rotates that gamma epsilon stalk and that powers the synthesis of the ATP molecules within the stationary alpha three beta three hexamer structure. The final question is how many protons actually have to move across the inner membrane of the mitochondria to synthesize a single ATP molecule? Well, as we saw in the previous lecture, a rotation of 360 degrees of the gamma epsilon structure actually produces a total of three ATP molecules. Why? Well, because in the alpha three beta three structure we have a total of three beta structures and each one of these beta structures actually synthesizes a single ATP molecule. And so when this gamma epsilon structure rotates 360 degrees it is able to generate the three ATP molecules.