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ESI mass spectra obtained from aqueous solutions containing 10 μM ubiquitin with 1.0 mM NaCI and (a) no additional additive, (b) 1.0 M ammonium acetate, (c) 25 mM ammonium bromide, (d) 25 mM ammonium iodide, or (e) 1.0 mM NaSbF6. Insets show an expanded region of the 5+ charge state.
