Structure of the COPI Coat (IMAGE) European Molecular Biology Laboratory Caption Left: A triad, the building block of the COPI coat / Right: COPI coated vesicle made of an assembly of triads Dark blue: alpha-COP / light blue: beta prime-COP / cyan: epsilon-COP / dark green: beta-COP / light green: gamma-COP / orange: delta-COP / yellow: zeta-COP / pink: Arf1. Credit Svetlana Dodonova/EMBL Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.