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The architecture of the COPII coat. The vesicle-coating COPII complex consists of only five proteins. Sec13 and Sec31 assemble the outer shell, while Sec23, Sec24 and the membrane bound Sar1•GTP assemble the inner shell of COPII. In contrast to the pore membrane domain, the curvature of membrane-bound vesicles is convex in all directions.
