Now, the type of structure that is formed depends on the type of lipid molecule that we have in the aqueous environment. And we'll see why in just a moment. So when certain lipids are placed into water, they will spontaneously rearrange themselves to form structures called MiCell. So let's suppose we have a single fatty acid and we take that fatty acid and place it into solution. Now let's suppose this fatty acid is ionized. So what does that mean?