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COPI vesicles serve for transport of proteins and membrane lipids in the early secretory pathway. Their coat protein (coatomer) is a heptameric complex that is recruited to the Golgi by the small GTPaseArf1. Although recruited en bloc, coatomer can be viewed as a stable assembly of an adaptin‐like tetrameric subcomplex (CM4) and a trimeric ‘cage’ subcomplex (CM3). Following recruitment, coatomer stimulates...