So this section is the hook that is attached to our sleeve, to the rod, and these proton rings. Now, the proton rings basically serve as proton pumps. They essentially pump our protons, the hydrogen ions, across our cell membrane. And by pumping our protons, our hydrogen ions, down our electrochemical gradient, we rotate the proton rings, which in turn rotates the rod and the sleeve, which in turn rotates the rest of our Flagellum structure. And this rotation creates the motion of our Flagellum. Now, whenever our Flagellum in prokaryotic cells rotates counterclockwise, that creates a unidirectional emotion, meaning our cell moves along one axis, along one direction.