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Protein levels of acetyl-histone H3 (K9/K14), acetyl-histone H3 (K14) and acetyl-histone H4 (K12) in the hippocampus were detected by western blot. The levels of β-actin serve as an inner control. Three rats in each group. The right bar graph shows the relative band density of each protein in each group, and the data are shown as the means ± S.E. (** p<0.01).
