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Reconstructed ion chromatograms for (A) native (1281.8→1054.3), and (B) stable-isotope labelled (1285.3→1057.6) peptides which elute at ~40 min. The native peptide has the amino acid sequence GTVVVPTLDSVLYDNQEFPDPEK and in the stable-isotope labelled peptide leucine-8 contains 13C615N. Data acquired on the LCQduo.
