So this is what it basically looks like. And what it is is it's this pump that utilizes ATP molecules to create an electrochemical gradient and it pumps the sodium ions to the outside and the potassium ions to the inside. Now, because it uses ATP molecules, ATP molecules are only found in the cytoplasm. And what that means is this protein has to be positioned in the proper orientation so that the proper side can actually interact with the ATP molecule. And this has to be positioned in the proper orientation because we want to move the sodium this way and the potassium this way, and not in the opposite direction. And so we see that the proper positioning of this protein within the membrane determines its functionality.