Some steps of membrane transport require the formation of vesicles coated with COPI, COPII or clathrin. The coats probably generate the forces necessary to bend a relatively flat membrane into a ...
A protein called coat protein II (COPII; green) forms vesicles that transport from the endoplasmic reticulum (ER) to the Golgi. A different protein called coat protein I (COPI; red) forms vesicles ...