Now the f one region basically consists of those polypeptide chains which are responsible for actually binding the ADP molecules and the orthophosphate molecules and forming those ATP and releasing the ATP into the matrix of that mitochondria. So the f one region is the catalytic unit of this complex. So this region basically lies in the matrix of the mitochondria. And we find five different types of polypeptide chains. Within the f one region we have the alpha shown in dark green. We have the beta shown in light green.