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The amyloid β-protein transiently forms low and high molecular mass oligomers and protofibrils in vitro, and after longer incubation times assembles into polymorphic mature fibrils. The precursor-to-product relationship of these species remains to be understood. Protofibrils are up to ∼600nm in length and have mass-per-lengths of 19(±2)kDa/nm measured by scanning transmission electron microscopy....
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