Figure 1. NeuN immunohistochemistry in the hippocampus of young (A), adult (B), and aged (C) gerbils. Numbers of NeuN immunoreactive neurons are not significantly different among all the groups. GCL, granular cell layer; MoL, molecular cell layer; PoL, polymorphic cell layer; SL, stratum lucidum; SO, stratum oriens; SP, stratum pyramidale. Scale bars=400 (A-C), 100 (A1-C3) µm. D: The relative number of NeuN immunoreactive neurons in the dentate gyrus, CA2/3, and CA1 region (n=7 per group). The bars indicate the means±SEM.