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ETD product ion spectra following dissociation of a 24 residue peptide. Numerous c- and z•-type fragment ions are generated and detected. The insets display a small m/z region when analysis of these products was performed either with the ion trap or orbitrap. Here the mass resolution offered by the orbitrap allows for unambiguous identification of two closely spaced isotopic clusters of z•-type fragment ions. This figure was adapted from reference 40.
