And as that stalk basically rotates it will cause the catalysis of the ADP and the orthophosphate to form the ATP molecules and the subsequent release of those ATP molecules into the matrix of the mitochondria. So once again the GAM epsilon central stalk will interact with the hexamer ring. As the stalk rotates it stimulates the synthesis and the release of ATP molecules and we'll discuss the details of that in a future lecture. And finally we have this delta chain as shown right over here. Now the delta subunit basically helps hold this entire hexameric structure in place so that it doesn't actually rotate. It is also actually used to connect this hexameric structure to this structure here that is part of the F not unit.