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Dissociation channels observed in CTD of insulin at charge states of 4+, 5+ and 6+. Key for peptide sequencing: black line, product ions observed in charge state 1+; red line, product ionsed observed in charge state 2+; red line with arrow, product ions observed in charge state 3+; fragment ion with another chain attached are marked with a green line. The same color-coding system was used throughout this study.
