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A decrease in CA1 and CA3 neuron densities (Nv, mm3; a,b) was correlated with older age in the chimpanzee brain (ps ≤ 0.02). Photomicrographs of Nissl staining in hippocampal subfields CA1 (c,d) and CA3 (e,f) in a young chimpanzee (c,e) and an old (d,f) chimpanzee brain. Scale bar = 250 µm. (Online version in colour.)
