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. Author manuscript; available in PMC: 2016 Nov 15.
Published in final edited form as: Int J Mass Spectrom. 2015 Nov 15;390:101–109. doi: 10.1016/j.ijms.2015.07.013

Figure 1.

Figure 1

The ISD spectrum of the aged β2M peptide (1–36) using the 1,5-DAN/2-PA matrix, obtained on the MALDI-FTICR mass spectrometer. Insets show the zoomed-in view of the spectral region corresponding to the isoAsp17-diagnostic ion in the ISD spectra of (a) the aged and (b) the unaged sample.