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The ESI-QTOF mass spectra of the 15th charge state of β-lactoglobulin subjected to different labeling conditions. Spectrum (a) is of the 15 mM Na2S2O8 control, absent only laser irradiation; (b) is of 15 mM Na2S2O8 FPOP; (c) is of 5 mM Na2S2O8 FPOP; (d) is of 15 mM H2O2 FPOP.
