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(Color online) Vesicular transport pathway. Transport between compartments is mediated by vesicular carriers. Three types of vesicles mediate intracellular transport. Coat protein complex II (COPII) vesicles mediate transport from the ER. Coat protein complex I (COPI) vesicles act in intra-Golgi transport and retrograde transport from the Golgi to the ER. Clathrin vesicles mediate transport between the Golgi and the plasma membrane.
