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( Vesicle (biology))
A vesicle is a small bubble of liquid within a cell. A more formal definition in cell biology, would be that a vesicle is a relatively small, intracellular, membrane-enclosed sac that stores or transports substances. Vesicles form naturally because of the properties of lipid membranes (see micelle), however in a cell most vesicles have specialized functions depending on what materials they contain. Because vesicles tend to look alike, it is very difficult to tell the difference between different types of vesicles without sampling their contents. Vesicles, however, are used mainly for storage and transport of materials within a cell. The vesicle is separated from the cytosol by at least one lipid bilayer. If there is only one lipid bilayer, they are called unilamellar vesicles; otherwise they are called multilamellar. (Lamella means membrane). Vesicles store, transport, or digest cellular products and waste. The membrane enclosing the vesicle is similar to that of the plasma membrane, and vesicles can fuse with the plasma membrane to release their contents outside of the cell. Vesicles can also fuse with other organelles within the cell.
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