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Example of LC-MS/MS separation, detection, and identification of unmodified and oxidatively modified species of peptide 190-198. (A) XICs of unmodified and singly oxidized peptide 190-198; (B) mass spectra of precursor ions (+2 charge) show a 16 Da shift from unmodified to modified peptide 190-198; (C) the product-ion (MS/MS) spectra of the singly oxidized peptide 190-198 locates modification on Phe191.
