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Amyloid. a: Light micrograph of an amyloid plaque in the brain of an Alzheimer patient showing characteristic orange-green birefringence under illumination using crossed polarizing filters (Congo red stain, Nissl counterstain (blue); Bar = 50μm). b: Electron micrograph of massed amyloid fibrils in a plaque from an Alzheimer patient. The average width of amyloid fibrils in vivo is 7–13 nm (17). Bar = 200 nm.
