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The redox potential of Q A in Photosystem II (PSII) from Thermosynechococcus elongatus was titrated monitoring chlorophyll fluorescence. A high potential form (E m =+60±25mV) was found in the absence of Mn 4 Ca, the active site for water oxidation. The low potential form (E m =−60±48mV), which is difficult to measure in conventional titration experiments, could be “locked...
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