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Typical crystal structure of hexamer made up by the peptide GNNQQNY. The β-strands are oriented perpendicular to the fibril axis (dashed line). The distance between two neighbor strands in the parallel β-sheet is 4.78 Å, and the distance between two antiparallel β-strands is 8.7 Å. The index for each peptide is enumerated as S1, S2, S3, S4, S5, and S6.
