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Close-up view of the MAS NMR atomic-resolution structure of the triplet fibril fitted into the cryo-EM reconstruction (Center). The background image of the fibril (Left) was taken using TEM. (Scale bar, 50 nm.) The fibril surfaces (Right) are shown at 1.0σ (white) and 2.2σ (yellow) above the mean density, respectively, and the constituent β-sheets are shown in a ribbon representation; oxygen, carbon, and nitrogen atoms are shown in red, gray, and blue, respectively.
