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Coronal section through the dorsal hippocampus demonstrating layers in CA1 region of Fischer 344 x Brown Norway rats. Quantifications of synapses and neurons were confined to stratum radiatum and stratum pyramidale respectively. SO: stratum oriens; SP: stratum pyramidale; SR: stratum radiatum; SLM: stratum lacunosum-moleculare. Scale bar = 400 μm.
