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N-terminal isoAsp residue diagnostic fragment peak [M + 2H − 74]+• detection for the Aβ1–10 peptide variant (iDAEFRHiDSGY, fraction XI in the figure 3, top panel) by: (a) ETD on LTQ-Orbitrap, with supplemental activation energy parameter 15; and (b) ECD on SolariX. Insets show diagnostic peaks and their S/N ratios.
