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Electron-transfer dissociation spectrum of a) the [M+3H]3+ glycopeptide ion after reaction with sulfur dioxide anions, and b) the [M+3H]3+ glycopeptide ion after reaction with nitrobenzene anions. Ions corresponding to fragmentation of the glycan structure likely arises from CID of the [M+3H]3+ and [M+2H]2+ ions during mass analysis, as described in the text.
