Photosystem II. Molecular model of the photosystem II complex. Photosystems are protein complexes involved in photosynthesis. Photosystem II is found on the thylakoid membranes of cyanobacteria, algae and plants. It is the first step in photosynthesis. It absorbs light and uses the energy to drive the oxidation of water, creating oxygen as a byproduct, and the reduction of plastoquinone.
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