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. Author manuscript; available in PMC: 2008 Nov 1.
Published in final edited form as: J Proteome Res. 2007 Sep 28;6(11):4230–4244. doi: 10.1021/pr070313u

Figure 6. ERPA (CID / ETD) analysis of a serine phosphorylated peptide (pS 1046) from the Lys-C digest of EGFR.

Figure 6

A: Base peak ion chromatogram. B: CID-MS2 spectrum of the m/z 1452.68 (3+) ion. C: ETD-MS2 spectrum of the m/z 1089.78 (4+) ion. D: CRCID-MS3 scan of the m/z 1452.75 ion. (from the ETD spectrum as indicated by the dotted circle). The peptide sequences with the observed fragment ions are shown in the insert: phosphoserine is indicated as pS. The neutral loss of phosphate is also shown.