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MALDI-PSD fragmentation spectra of the peak at m/z 1227.8 and synthetic Aea-HP-1. The molecular ion m/z 1227.8 was subjected to PSD analysis. The final spectrum was constructed from 7 to 8 spectral segments, stitched together using the Voyager software and interpreted to enable sequence determination; synthetic Aea-HP-1 was also subjected to MALDI-PSD, giving an almost identical fragmentation spectrum (not shown).
