IL-4 shows increased CD11b immunostaining. A and B CD11b staining of hippocampal sections of the AAV-GFP- and the AAV-IL-4-injected mice, respectively. C and D Staining in the dentate gyrus (DG); an arrow shows the site of the hippocampal injection. E The percentage of binary area occupied by the positive immunostain in the hippocampus across all samples; F uses (N = 4) for AAV-IL4 samples because of damage in the frontal cortex of two AAV-IL-4 mice. *P < 0.05 between the AAV-GFP control (N = 8) and AAV-IL-4 (N = 6).