 The best characterized type of vesicle is the clathrin coated vesicle (CCV).The formation of a COPII vesicle at the endoplasmic reticulum and its transport to the Golgi body.The involvement of the heterotetramer of COPI is similar to that of the AP/clathrin situation, but the coat of COPI is not closely related to the coats of either CCVs or COPII vesicles.