And what that tells us is it gives us the permeability of the cell membrane to that particular amino acid. And we can conduct many different types of experiments that basically provide us with information about different aspects, different properties of that membrane, such as the permeability of that membrane. Now, we can also use them to basically deliver drugs and other things to patients. For instance, let's suppose a patient has some sort of tumor in their body, and a tumor is basically a collection of these cancerous cells. And so we can build these liposomes, and we can direct these liposomes to the cancerous cells of the tumor. And what happens is because the cells of the tumor are basic, also contain the same phospholipid bilayer membrane, these liposomes confuse with the cell membranes of those cancerous cells and that can in turn inject whatever drug is found inside the internal aqueous compartment into those cancerous cells and that can kill off those cancerous cells.