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MALDI-TOF mass spectra of tryptic peptide 97-112 (1818.07 m/z, KIVSD*GNGMNAWVAWR) showing the +14 Da mass increase in hydrazine-treated lysozyme (bottom, hydrazide) as compared to native lysozyme (1804.01 m/z, no hydrazine treatment, top, carboxylic acid).
