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(A) Extracted ion chromatograms of the native (540.26 m/z) and acylated (685.43 m/z) peptide (for clarity purposes, peaks have not been normalized). (B and C) MS/MS spectra of m/z 540.26 and m/z 685.43. In both spectra, the y fragment ions series perfectly match a CTSIVAQDSR sequence (bearing a side chain adduct on the cysteine in the second case).
