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MALDI TOF sequencing of a trimer of oxidized DOPA-neurotensin N6. The trimer was incubated with a 10:1 peptide:subtilisin ratio (w/w) in a 10-mM HEPES pH7.5 buffer. The spectrum corresponds to a 30-min digest. Peak labels in parenthesis reflect the mass lost to digestion, and are explained further in Table 2. Peaks labeled "S" correspond to subtilisin fragments.
