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. 2006 Jul 17;34(11):3267–3278. doi: 10.1093/nar/gkl429

Figure 1.

Figure 1

Mass spectra of singly and doubly phosphorylated peptides. (A) Corresponding MS2 and MS3 spectra of the NSVVpSPVVGAGGDSSK peptide of RSZ33. (B) Corresponding MS2 and MS3 spectra of the peptide of SGQpSDEpSDGEVAVR of DEAH box RNA helicase encoded by At1g32490. pS indicates a phospho-Ser residue; S* indicates a phospho-Ser residue that has lost its phosphate group.