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produces 1 ATP / 3 H⁺. However the exchange of matrix ATP for cytosolic ADP and Pi (antiport with OH^- or symport with H⁺) mediated by ATP-ADP translocase and phosphate carrier consumes 1 H⁺ / 1 ATP as a result of regeneration of the transmembrane potential changed during this transfer, so the net ratio is 1 ATP : 4 H⁺.
** The mitochondrial electron transport chain

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