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Tandem mass spectra of the triply charged precursor ion at m/z 734.70 (BPDE adduct of peptide RHPYFYAPELLFFAK) obtained by ETD activation (a) or CID activation (c) and tandem mass spectra of the doubly charged precursor ion at m/z 525.25 (BPDE adduct of peptide ASSAKQR) obtained by ETD activation (b) or CID activation (d).
