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Light-minus-dark subtraction absorption spectra of PS II complexes at different redox potentials. (A) Synechocystis monitored in the red region in the presence of betaine, (B) A. marina monitored in the blue region in the presence of betaine, (C) Synechocystis monitored in the red region in the absence of betaine, and (D) A. marina monitored in the blue region in the absence of betaine.
