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The Aβ(1-40) secondary structure changes during aggregation shwon by CD. The investigated samples are: fresh sample 10 μM (curve 1), fresh sample 100 μM (curve 2), 4-h aged sample (curve 3), 10-h aged sample (curve 4), 72-h aged sample (curve 5), and 6-day aged sample (curve 6). All the aged samples were measured at concentration 100 μM.
