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Formation of fibrils and amorphous aggregates of Aβ peptide in the presence of Cu(II) and the suggested role of the simultaneous intramolecular coordination by two imidazole rings of His13 and His14. With a significant amount of Subcomponent IC, the β-sheet and non–β-sheet structures coexist, which leads to the preference of amorphous aggregates over fibrils.
