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

Figure 3.

Figure 3

 Normalized relative abundance of peptide fragment ions versus ECD cathode potential for (a) the unmodified peptide (APLSFRGSLPKSYVK); (b) the singly modified phosphopeptide (APLSFRGSLPKPSYVK).