So now, once this takes place, the ATP can leave this binding pocket into the intermembrane space and then move into the cytoplasm via a protein found on the outer membrane of the mitochondria known as the mitochondrial porin. And once we get to this stage, the cycle can basically repeat itself. Now, one last thing I'd like to mention about the movement of these ADP ATP molecules is the following. Remember that because the electron transport chain actually generates an electrochemical gradient for the protons, what that does is it creates a net positive charge on the outside portion of the inner membrane and a negative charge on the inner portion of the inner mitochondrial membrane. Now, ATP molecules have a greater charge than ADP molecules. ATP have a net charge of negative four, while ATP have a net charge of negative three.