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Phosphopeptide mass spectra. ETD mass spectra recorded on (M + 6H)+6 ions at m/z 683.3 for a 35 residue phosphopeptide of MW 4,093 (A), and (M + 3H)+3 ions from a pHis containing peptide at the C terminus of the septin protein, Cdc10 (B). Observed c and z· ions are indicated on the peptide sequence by ⌉ and ⌊, respectively. Observed doubly charged c and z· ions are indicated by an additional label, circle and asterisk, respectively.
