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Ca 2+ and Cl − ions are essential elements for the oxygen evolution activity of photosystem II (PSII). It has been demonstrated that these ions can be exchanged with Sr 2+ and Br − , respectively, and that these ion exchanges modify the kinetics of some electron transfer reactions at the Mn 4 Ca cluster level (Ishida et al., J. Biol. Chem. 283 (2008) 13330–13340)...
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