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LC-MS/MS analyses of Alb digests obtained from (A) mouse control, (B) mouse exposed to phenylethylisothiocyanate-(PEITC)-AcCys, (C) human exposed to watercress, and (D) the PEITC-Lys standard compound. The right panels show the chromatogram of the IS, PEITC-[13C615N2]Lys, which was added at the beginning of digestion procedure. PEITC-Lys and PEITC-[13C615N2]Lys were detected with the MRM transitions m/z 308.1/145.0 and 316.1/153.0, respectively.269
