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Redox titration of QA/QA− in PS II complexes with and without the Mn cluster in A. marina (A), Synechocystis (B), and spinach (C) PS II particles. ○, PS II complex with the Mn cluster; ● and ▲, PS II complex without a Mn cluster. NH2OH and CHES indicate the hydroxyl amine treatment for the Mn depletion.
