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a, ESI-MS/MS spectrum of the synthetic peptide NDEGIAYR. b, the same MS/MS spectrum annotated assuming the peptide sequence LY*SLGKGR reported in Gokulrangan et al. (22) where * indicates nitration. c, the synthetic peptide LY*SLGKGR was also synthesized and showed little similarity to the MS/MS spectrum of NDEGIAYR.
