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COX-2 immunoreactivity in the hippocampal CA3 region of Co12-ZLC (A), Co12-ZDF (B), Ex12-ZLC (C), Ex12-ZDF (D), Co30-ZLC (E), Co30-ZDF (F), Ex30-ZLC (G) and Ex30-ZDF (H) rats. COX-2 immunoreactivity is observed in the stratum pyramidal (SP, asterisk). Note that COX-2 immunoreactivity is strong in most exercised groups except the Ex30-ZDF group. SO, stratum oriens; SR, stratum radiatum. Scale bar=100 µm.
