So it's the hydrophobic effect that plays the role that drives the formation of the cell membrane and these micelles. So there are three things that we have to remember about cell membranes because of this discussion. Number one is the cell membrane forms spontaneously and once it forms, it forms a closed compartment. So this entire cell membrane will basically form a closed compartment in which we'll have an aqueous environment inside that is separate of the aqueous environment that is found on the outside. Number two, the major difference, or one important difference between my cells and the lipid bilayer is these structures can only form very small structures, but these can become very, very large. In fact, our diameter of my cells is usually 20 nm, but the diameter of these can be up to 1 million.