The figure shows examples of GFAP + astrocytes from a naïve control rat (A, E, I), a sedentary GWI rat (GWI-SED; B, F, J), and a GWI rat that performed RE (GWI-RE; C, D, K) in the dentate gyrus (DG; A-C), the CA1 subfield (E-G), and the CA3 subfield (I-K) of the hippocampus. The bar charts D, H, and L compare the area fraction (AF) of GFAP + structures in the DG (D), the CA1 subfield (H), and the CA3 subfield (L) of the hippocampus between different groups. Scale bar, A-C, E-G, I-K = 50 μm; *, p < 0.05, and **, p < 0.01.