The mobile cytochrome that transports electrons from Complex III to Complex IV of the respiratory chain.
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cytochrome c n, often italicized 3d c the most abundant and stable of the cytochromes
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a cytochrome on the inner mitochondrial membrane that accepts electrons from ubiquinol–cytochrome-c reductase and transfers them to cytochrome-c oxidase, part of the electron transport chain (q.v.).Medical dictionary. 2011.