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Drawing of the known functional locations of coatomer. COPI, indicated in bright green, is present at many locations including the ERGIC, Golgi, early endosomes, and multi-vesicular bodies. Note that these locations correspond to the many functions of COPI in a typical cell including facilitating retrograde transport from the Golgi to the ERGIC and ER, anterograde transport among Golgi stacks, and transport among compartments in the endosomal pathway.
