Vesicles are small, membrane-bound spheres whose contents are isolated from the surrounding cytoplasm. Extremely important for the movement of material within cells, vesicles are formed by membrane budding from organelles such as the endoplasmic reticulum and Golgi complex, and can be moved along cytoskeletal elements by motor proteins. Endocytotic vesicles bud from the plasma membrane of the cell, bringing surface membrane and material to the interior, and exocytotic vesicles fuse with the plasma membrane, releasing their contents to the outside world. .Vesicle. is a fairly general term, and is sometimes used for more specific structures such as endosomes.

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