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Peptide SLDMDSIIAEVK sequence from cytokeratin-8. A shows an extracted ion chromatogram (XIC) for three different MRMs for peptide ion 804.9 m/z. B shows a full-scan tandem mass spectrum confirming the sequence. C, quantitative MRMs showing extracted ion chromatogram for the same peptide parent ion with same LC retention time, but iTRAQ reporter ions were used as targets for Q3. cps, counts/s.
