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(a) Isolation windows for a series of Ac-KGx (x=0 to 5) peptides that have been complexed with 18C6. The predicted masses and isotope distributions are shown as red lines. The mass shifts increase as more glycine residues are added to the peptide. (b) Precursor ion survival as a function of excitation voltage/degrees of freedom. Again, additional glycine residues lead to decreased stability
