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Representative HX-MS spectra of intact Aβ(1-40) (left), and two reporter peptides 1-19 (middle) and 20-40 (right) from freshly prepared sample. The labeling time for each sample is marked on the left side of each row of spectra as 10 sec, 10 min and 1 h. The assignments of peaks are marked with L (LMW oligomers) and M (monomer). Intact Aβ(1-40) spectra are reproduced from Qi et al. (25) by permission.
