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The roles of Ca 2+ in H 2 O oxidation may be as a site of substrate binding, and as a structural component of the photosystem II O 2 -evolving complex. One indication of this dual role of the metal is revealed by probing the Mn cluster in the Ca 2+ depleted O 2 evolving complex that retains extrinsic 23- and 17-kDa polypeptides with reductants (NH...
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