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Histological changes in the dentate gyrus of the hippocampus between the early and late PID period following PPA administration (A, B). Quantitative results for GCL thickness (C) and GC diameter (D). Data are shown as the mean ± SD. Cont, control rats; ASD, PPA-treated rats; GCL, granule cell layer; GC, granule cell. **p < 0.01: vs. Cont.
