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The mass spectra (A, B, C) and deconvolved mass distributions (D, E, F) of streptavidin in the presence of no additive (A, D), 40 mM imidazole (B, E), and 40 mM 2-isopropylimidazole (C, F). The in-source trapping collision voltage was increased from 0-180 V in increments of 20 V as shown by various colors.
