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Transition to seizure after intra-CA3 kainic acid injection recorded by silicon probe implanted in CA1–dentate gyrus. Eight recording sites were selected for demonstration. Epileptiform activity first appeared in the dentate gyrus and much later in CA1. The histological section with the track of the silicon probe (white arrows) is shown on the left. or., Oriens; pyr, pyramidale; rad, radiatum; lac-mol, lacunose-moleculare; fis, fissure; gr, granular; hil, hilus.
