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The photosynthetic conversion of water to molecular oxygen is catalyzed by the Mn4CaO5 cluster in Photosystem II and provides nearly our entire supply of atmospheric oxygen. The Mn4CaO5 cluster accumulates oxidizing equivalents in response to light-driven photochemical events within Photosystem II and then oxidizes two molecules of water to oxygen. The Mn4CaO5 cluster converts water to oxygen much...
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