English: This microscopic image shows corpora amylacea (purple spheres) in the brain of a person who had died with Alzheimer's disease. Corpora amylacea are common in the aging human brain, although they are more numerous in certain neurodegenerative diseases such as Alzheimer's. The region in the center is the taenia of the fimbria, part of the hippocampal formation. The tissue section was stained with the periodic acid-Schiff stain (pinkish/purple) along with a silver stain (black). The bar indicates a distance of 50 micrometers (0.05 millimeters).
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