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Nanoelectrospray mass spectra of ~1:1 mixtures of ~10 μM reduced/carboxymethylated RNase A (a) and reduced/carbamidomethylated RNase A (c) with native RNase A from 200 mM ammonium acetate (pH 7.2) solutions containing 0 or 1.5% <i>m</i>-NBA. Normalized abundances of each charge state as a function of <i>m</i>-NBA concentration for reduced/carboxymethylated RNase A (b) and reduced/carbamidomethylated RNase A (d) with native RNase A.
