Mean percentage of black pixels indicating CD11b expression area in the dentate gyrus (DG). A two-tailed t test revealed that there were significantly larger areas of CD11b expression in Gunn rats than in Wistar rats. *P ≤ 0.005, **P ≤ 0.001, vs Wistar. Data are presented as mean ± SEM. Area of hippocampus: hilus; GL = granular layer; ML = molecular layer; SGZ = subgranular zone.