“…*p Ͻ 0.05; **p Ͻ 0.01; ***p Ͻ 0.001. ever, some more recent studies have examined the role of changes in chromatin structure induced by the alterations to epigenetic factors during cognitive processes (Roth and Sweatt, 2009). Thus, histone acetylation and histone methylation have been demonstrated to be critical processes in regulating gene expression during learning and memory (Alarcó n et al, 2004;Korzus et al, 2004;Levenson et al, 2004a;Wood et al, 2005;Vecsey et al, 2007;Fontán-Lozano et al, 2008;Gupta et al, 2010). Changes in DNA methylation during learning and memory processes have also been described as critical steps in gene expression (Miller et al, 2007;Lubin et al, 2008;Feng et al, 2010).…”