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(Upper) Femtosecond-resolved fluorescence up-conversion traces from a solution of Monellin in a 0.1 M phosphate buffer at three fluorescence wavelengths. (Lower) Comparison of the normalized decays of the up-conversion signals for native Monellin at 326 nm and Trp at 330 nm in a 0.1 M phosphate buffer. In this plot, the long-time part of the signals was subtracted, and the remaining part was normalized for comparison.
