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CID product ion spectrum of peptide Tyr-1–Arg-19 from chimpanzee (Pan troglodytes). Precursor ion, MH+, is represented by the peak at the highest m/z (2,278.0). Peptide sequence ions produced on cleavage of peptide bonds are labeled by using Roepstorff nomenclature (4); only y ions are labeled. Insets show the expanded region of the spectrum. The sequence given by the y ions series is Tyr-Leu-Tyr-Gln-Trp-Leu-Gly-Ala-Pro-Val-Pro-Tyr-Pro-Asp-Thr-Leu-Glu-Pro-Arg.
