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Time course of absorption of PS I monomers from A. platensis at 826 nm as a function of time. The absorbance increase due to the photoaccumulation of P700+• is induced by far-red monochromatic light from cw laser diodes with the indicated wavelengths. Bottom graph shows for comparison the time course upon excitation with LED light at 456 nm (293 K, 1 mM ascorbate).
