One of two multimeric complexes that forms a membrane vesicle coat. The mammalian COPI subunits are called alpha-, beta-, beta'-, gamma-, delta-, epsilon- and zeta-COP. Vesicles with COPI coats are found associated with Golgi membranes at steady state. [GOC:mah, PMID:11252894]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component