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(a) Laser beam train sequence for the pump-probe experiment. One sequence of beams is applied to each pixel during sample scanning. (b) Effect of primary thiols (with 50 mM KI) on the switching characteristics of the Cy3-Alexa647 heterodimer. (c) The residual and recovered fluorescence levels against KI concentration in 143 mM MEA solution. Inset, the fluorescence intensity decreases with increasing concentration of KI. (Error bars: standard deviations).
