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(A,B) Schematics of the experimental procedures. Mean of histone H3 and histone H4 acetylation level (+SEM) in the dorsal hippocampus 30 min, 1 h or 2 h after hippocampal injection of saline or NaB performed after acquisition (C,E,G) and after reactivation (D,F,H) (n = 4–5 per group). *P < 0.05; **P < 0.01 and ***P < 0.001 Saline vs. NaB.
