Figure 7: Representative photomicrographs (a) showing that valproic acid (VA) treatments reverse the increased TNF-alpha immunoreactivities of the 6-OHDA group in CA1 and CA3 hippocampus subfields. Scale bars represent 200 μm (magnification ×100). In (b), histograms are shown with relative optical densities measured with the Image J software. CA1: a. versus SO, ; b. versus 6-OHDA + VA50, ; c. versus SO, , . CA3: a. versus SO, ; b. versus 6-OHDA + VA50, ; c. versus 6-OHDA, (one-way ANOVA and Newman-Keuls as the post hoc test, and unpaired Student’s -test).