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Photobleaching of muscle illuminated with visible (568 nm, shaded) and IR (820 nm, black) laser beams. The lasers had the same intensity as used in the experiments. The fluorescence intensities (‖I⊥) have been normalized and fitted with four-parameter exponentials 0.23e−0.687t + 0.78e−0.034t and 0.13e−0.388t + 0.86 for 1P and 2P, respectively.
