So basically, there are certain instances inside our body and inside the bodies of other organisms when these cells must be able to actually quickly and effectively move the water molecule from one side to the other side. And that's when these aquaphones are actually used. Now, it's important to note that aquaporns are not actually ion channels. What that means is they don't actually allow the movement of molecules that contain charge or ions. They only allow the movement of water molecules. So they're water channels that allow the movement of molecules, water molecules down their concentration gradient when the cell requires it.