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Fig. 2. Electron distribution among the redox centers of E. coli SQR and QFR. *The distribution of two electrons was calculated assuming an equilibrium distribution among independent redox centers of given reduction potentials at 298 K. One-electron reduction potentials of the flavin quinone/semiquinone and semiquinone/hydroquinone are treated as the same. For details, see (1) and reference 16 therein. {dagger} The value for bovine SQR is used. [Figure and legend are from (1)]

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