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Tandem mass spectra of the singly charged Carboxypeptidase A tryptic peptide NWDAGFGK obtained by (A) 157 nm photodissociation, (B) post-source decay, (C) ion trap CID, (D) 2 keV TOF-TOF CID, (E) 157 nm photodissociation following peptide guanidination (Cui et al., 2005).
