Figure 6.
ETD-MS/MS analysis of phosphopeptide no. 23 (VGEEEHVpYSFPNK). (A) ETD-MS/MS of the [M++ + H]3+ precursor ion from the doubly derivatized phosphopeptide. (B) ETD-MS/MS of the [M+3H]3+ precursor ion from the underivatized phosphopeptide
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