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Representative photomicrographs of hippocampi from sham, RTBI at 24-h intervals, and 4RTBI at 72-h intervals. Sections are labeled with Aβ42 (A–C), Aβ40 (D–F), and thioflavin-S (G–I). Scale bar, 250 μm. Also shown are the quantification of plaque density measured by as Aβ42 (J), Aβ40 (K), and thioflavin-S (L). *p < 0.05 versus sham group; †p < 0.05 versus rTBI24 group. Data represented are means ± standard error. Aβ, β-amyloid; rTBI, repetitive mild TBI.
