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Nissl-stained coronal sections showing residual spots of dye indicating representative placements of tetrodotoxin infusions into the ventral hippocampus (CA3 region) on postnatal day 7 (PD7) (a), PD32 (b), and infusions into the dorsal hippocampus (dorsal dentate gyrus) on PD7 (c). All histological representations are from mature rats (>PD56).
