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The effects of chronic exposure to HgCl2 on astrocyte density (GFAP+ cells) in the CA1 (a–c), CA3 (d–f), and hilus (g–i) of the hippocampus of adult Wistar rats. Results are expressed as mean ± standard error of the number of cells counted per field in each region (c, f, g). ∗p < 0.05 compared to the control group (Student's t-test). Scale bar: 20 μm.
