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CID MS/MS spectra of (a) [P3+3H]3+ (m/z 855); (b) doubly charged peptide d(m/z 628); (c) doubly charged peptide e (m/z 656); and (d) [peptide f+H]+(m/z 1309). Note that e arose from full reduction of peptide P3 while f resulted from partial reduction of peptide P3.