So this rotates and that causes the entire Ce ring to actually rotate. And so what happens is this negative charge of the aspartate 61 on this C subunit basically moves into this position shown here. And this aspartic acid basically that is found within this C submune moves into this position. And now this H plus ion can move from this area to an area where we have a low proton concentration in the matrix of the mitochondria. And in this fashion we see that the movement of these protons from the high concentration to the low concentration basically powers the movement of this C rink. So once again in diagram one an H plus ion will enter the half channel of the A subunit facing the intermembrane space and it will bind to that aspartate residue of the nearby C subunit.