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The Mn4CaO5 cluster of photosystem II (PSII) catalyzes the oxidation of water to molecular oxygen through the light-driven redox S-cycle. The water oxidizing complex (WOC) forms a triad with TyrosineZ and P680, which mediates electrons from water towards the acceptor side of PSII. Under certain conditions two other redox-active components, TyrosineD (YD) and Cytochrome b559 (Cyt b559) can also interact...
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