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Cell proliferation within the dentate gyrus of AU and AI rats. (a) Behavioral scores, as measured by the mean distance covered to find a hidden platform, of the AU and AI groups. The number of BrdUrd-IR cells (b) and of Ki67-IR cells (c) in the granule cell layer of AU rats is greater than that measured in AI rats. (d) In contrast, cell proliferation within the hilus is not influenced by the cognitive status of the aged rats.
