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HCD fragmentation spectra of heterodimeric disulfide bond linked peptide from B. variegata with molecular mass of 3469.924 Da. (a) Deconvoluted HCD spectrum of the large reduced chain, ([M + 6H]6+ at m/z 526.141 (monoisotopic peak) was selected for fragmentation). (b) Deconvoluted HCD spectrum of unreduced dimeric peptide, ([M + 6H]6+ at m/z 579.329 (monoisotopic peak) was selected for fragmentation. Insets highlight the loss of 1 N-terminal and 2 C-terminal residues
