And so ultimately it's the movement of the protons across the hemi channels across the semichannels of the F Naught region that allows the synthesis of these ATP molecules. Now, I have to mention the following important idea. So the only thing that rotates in ATP synthase is the searing as well as the gamma epsilon structure. Everything else remains stationary. So that includes the A subunit. So the A subunit of the F knob region doesn't actually move.