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. 2008 Sep;19(9):1263–1274. doi: 10.1016/j.jasms.2008.05.015

Figure 1.

Figure 1

 ECD mass spectra of doubly-charged ions of four synthetic peptides (APLS1FRGS2LPKS3YVK). ECD of (a) unmodified peptide at cathode potentials of (left) −3.34 V (standard) and (right) −13.34 V (cathode potential which gave the greatest sequence coverage) (6 scans); (b) Ser1 phosphopeptide at cathode potentials of (left) −3.34 V and (right) 14.34 V (4 scans); (c) Ser2 phosphopeptide at cathode potentials of (left) −3.34 V and (right) −14.34 V (7 scans); (d) Ser3 phosphopeptide at cathode potentials of (left) −3.34 V and (right) −14.84 V (9 scans).