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LC-MS/MS fragmentation profile of the oxidized Ac-c(CWAKC)-NH2 peptide, confirming the location of the site of oxidation on the Trp residue. The spectrum was acquired on a Bruker Esquire 3000+ ion trap tandem mass spectrometer. * is used to label the neutral loss of ammonia, o is used for water loss. Fragment ions in brackets are connected through a disulfide bridge.
