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The Protein Data Bank (PDB) structures of four selected forms of Aβ fibrils are: (a) 2BEG including the Aβ17–42 region; (b) 2MXU is characterized by the Aβ11–42 region; (c) 2NAO is conformed by the Aβ1–42 region; (d) 2M4J contains the Aβ1–40 region.
