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A liposome may be a spherical vesicle having a minimum of one lipid bilayer. The liposome is often used as a vehicle for administration of nutrients and pharmaceutical drugs. Liposomes are often prepared by disrupting biological membranes (such as by sonication). Liposomes are most frequently composed of phospholipids, especially phosphatidylcholine, but can also include other lipids, like egg phosphatidylethanolamine, goodbye as they're compatible with lipid bilayer structure. A liposome design may employ surface ligands for attaching to unhealthy tissue. The major sorts of liposomes are the multilamellar vesicle (MLV, with several lamellar phase lipid bilayers), the tiny unilamellar liposome vesicle (SUV, with one lipid bilayer), the massive unilamellar vesicle (LUV), and therefore the cochleate vesicle. A less desirable form is multivesicular liposomes during which one vesicle contains one or more smaller vesicles. Liposomes shouldn't be confused with lysosomes, or with micelles and reverse micelles composed of monolayers.