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The 275-nm excited fluorescence spectra of YEHK21 and tyrosine. The fluorescence of a YEHK21 sample kept at 4°C does not change for at least 4 weeks, whereas storage at room temperature resulted in a weaker and broader fluorescence peak. The fluorescence spectrum of tyrosine (as a part of tripeptide) aqueous solution was normalized with that of YEHK21 for comparison.
