And that's important because if these channels somehow were able to actually allow the movement of H plus ions, what that would do is it would disrupt the hydrogen ion gradients within our cells. And those gradients are important because as we'll see in a future lecture, we use these proton gradients to actually create ATP molecules. So we see that ions such as H plus ions will not be able to pass across due to the presence of the positive charges in that passageway at the center of that passageway, as shown here. This means that aquaphorns will not actually disrupt gradients such as the proton gradients that exist inside our cells which are used to produce things like ATP molecules. So we conclude that aquaphorians are not ion channels, but they are channels. They are selective channels that allow the movement.