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Zoomed tandem mass spectrum of [hIAPP + 4H]4+ at m/z 976.233 (a) is compared with that of [hIAPP + Cu(II) + 2H]4+ at m/z 991.459 (b). The remaining parent ions are shown in the insets. The copper adduct is observed for the fragments b25 and b26, but it is absent for b17.
