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Electrospray ionization-MS of deuterated fibrils in protonated solvent after (a) 3.5 min, (b) 21 min, (c) 4.8 h, or (d) 384 h. Mass spectra of protonated and partially deuterated Aβ(1–40) monomer from Fig. 1 a and d are reproduced for comparison as dashed lines in a. The average molecular mass (calculated as in Fig. 1) is indicated for each sample.
