The first structure that holds the F zero to the F one is that central stock that consists of the gamma and the epsilon. So the gamma epsilon central stock connects the F zero region to the F one region. On top of that, we also have this arm on the outside composed of the single A, the two B structures and the single delta structure that hold these two units together. So the F one and the F zero are connected at two points. Firstly, they're connected through the gamma epsilon central stock and then they're also connected through the arm formed by the A subunit, the two B subunits and the delta subunits. Now some of these polypeptide chains actually rotate and some of them are stationary.