And what it ultimately does is it allows the movement of not only small ions, but also relatively large polar molecules, for instance, sugar molecules. So monosaccharides things like glucose, it allows the movement of amino acids, it allows the movement of nucleotides and so forth. And so there are four important functions of gap junction. So they function in, number one, intercellular communication. Number two, in cell nourishment. So for instance, those cells of our body which are not found in close proximity to capillaries cannot receive the food from the capillaries.