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The experimental group treated with 5 mg/kg (i.p.) of BBR. The immunoreactivity of the PV-IR of moderate neurons of CA1–CA3 mouse hippocampal fields and DG of the hippocampus is observed. (I: the marginal layer, II: the pyramidal layer, III: the multiform layer; the arrows indicate PV-IR neurons (single arrow) and PV-IR fibers (double arrow) of the hippocampus; magnification ×20).
