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Mass spectra of DRP-AC4 isolated from frog skin secretion. (a) MALDI-TOF spectrum of the HPLC fraction at 126 min in Figure 3 corresponding to DRP-AC4; (b) Annotated MS/MS fragmentation spectrum. Predicted b- and y-ion MS/MS fragment ion series (singly- and doubly-charged) arising from MS/MS fragmentation. Observed ions are shown in coloured typeface.
