And liposomes can be very important because we can use liposomes to basically study the permeability of cell membranes. And we can use liposomes to basically deliver drugs and things like DNA molecules to the cells of patients. So what exactly does a liposome actually look like? Well, a liposome is basically this aqueous compartment that is surrounded by a bilayer, a membrane that consists of two layers of phospholipid molecules. So this is what it actually looks like. So it's kind of like a cell, except it's much smaller.