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ETD tandem mass spectra of triply charged tryptic phosphopeptide EKVNELpSKDIGpSEpSTEDQAMEDIK from α-casein with azobenzene radical anions (a) without activation; (b) with activation using the optimized broadband waveform with an amplitude of 3.0 Vp-p. (The peaks labeled with asterisks are present during the isolation.)
