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Effect of subsequent additions of FeCy on the fluorescence level of 9-AA. The conditions were the same as in Figure 2. After illumination, several aliquots of 0.2 μmol of FeCy were added to the cuvette. F0, Initial 9-AA fluorescence; F1, 9-AA fluorescence after actinic illumination; F2, F3, and F4, 9-AA fluorescence after subsequent additions of 0.2 μmol of FeCy.
