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ESI-Ion Trap mass spectra of modified peptides from L7/L12. (A) Triply protonated peptide ion containing residues 80–91. The 649.2 Th ion is the doubly protonated form of the peptide containing residues 80–91. The 613.3 Th ion is consistent with a doubly charged ion from which a glycine residue and a further 16 Da have been lost. (B) Doubly protonated ion containing residues 80–88.
