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The effect of Mas7 on chlorophyll a fluorescence yield and O2 level in the dark. Two milliliters of 5 mm Mes and 1 mm CaSO4, pH 6.0, contained 3 × 106 cells. Cell suspensions were not illuminated with actinic light. Far-red light (FR), 22 μm MP, and O2 were added (↑) or removed (↓) as indicated. This figure is a representative of 10 runs.
