And these two identical polypeptide subunits basically work together to create this conformation in which we have a binding pocket that can bind ATP and ATP. And this binding pocket actually alternates between facing the matrix side and facing the cytoplasmic side, as we'll see in just a moment. So because along the inner membrane of the mitochondria, we have the electron transport chain which actually functions to generate these ATP molecules from ADP molecules, we might imagine that the inner mitochondrial membrane contains a relatively high concentration of this specific translocase. And that's exactly right. So about 15% of the protein content of the inner mitochondrial membrane consists of ATP ADP Trams LoCASE. So now let's take a look at the following mechanism by which the ATP ADP translocase actually moves these two molecules across the inner mitochondrial membrane.