So we can generalize and break down the ATP synthase into two regions the rotating region and the stationary region. Now the rotating region basically consists of the sea ring. So this entire orange structure as well as that central stalk that consists of this red gamma structure and this blue epsilon structure. So the rotating region, the structure that actually rotates as those protons actually move through this ATP synthase is composed of the Cring and the gamma epsilon stock and everything else is basically the stationary region. So we see that this A unit, the two B units, this delta unit as well as the alpha and the beta units are all stationary, they do not actually move. In fact, this section here, this A, B and the delta units, this structure together holds this hexameric structure in place and prevents it from actually moving.