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Example of a spectrum at MS-1. In the analysis using the SILAC method, three differential peak clusters are observed based on the mass difference of the stable isotopes introduced into the peptide sequence. In the above spectrum of a doubly charged peptide with an m/z value of 549.86, the highest 13C614N4-Arg peak was analyzed for protein identification. Each peak cluster contains some additional peaks that derive from natural isotopes.
