And what sonication does is it uses the energy that is stored in sound waves. So we essentially bombard our solution with sound waves and the energy stored within those sound waves basically disperses and agitates. The solution of phospholipids allows them to basically move around and disperse within the aqueous solution. And that's exactly what allows us to form those liposomes, these vesicles that consist of this bilayer lipid membrane in which we have this internal aqueous compartment that is separated from the external Aqueous compartment. So, once again, lipid vesicles can be formed by mixing a lipid solution into an aqueous solution and then sonicating the solution. And sonication involves bombarding the solution with sound waves.