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MAIV using the LTQ Velos ESI source to perform ETD fragmentation of the MBP peptide +4 charge state ion (∼m/z 459). Top, total fragment spectrum; bottom, inset m/z 400–900. Sequence coverage is increased relative to previous ETD studies of this peptide (14). Red numbers indicate the charge state, and blue numbers the ion abundance. Sequence coverage is provided (top).
