Fixed brain tissues were embedded in paraffin, and 4 μm thick coronal sections were prepared. To detect Aβ, thioflavin-S staining was performed according to the manufacturer's instructions. All slides were deparaffinized by serial hydration using a graded ethanol series, followed by treatment of the slides with 1% filtered thioflavin-S (Sigma-Aldrich) and washing. The mounted slides were stored at 4°C before fluorescence microscopy imaging (Nikon, Shinagawa, Tokyo, Japan).
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