Mean number, relative optical density, dendritic length of DCX-immunoreactive neuroblasts and its protein level. Mean number of DCX-immunoreactive neuroblasts per section (A) and relative optical density (ROD) demonstrated as percentages of S-Veh in DCX immunoreactivity per section (B) in the dentate gyrus of S-Veh, Ex-Veh, S-D-gal, and Ex-D-gal groups. C: Mean of dendritic length of DCX-immunoreactive neuroblasts in the S-Veh, Ex-Veh, S-D-gal, and Ex-D-gal groups. D: ROD of the immunoblot bands is demonstrated as percent values (aP <0.05, between vehicle vs. D-gal groups, bP <0.05, between sedentary vs. exercise groups). All data are shown as the mean ± SEM.