Effects of treatment of mice with the histone deacetylase inhibitor, sodium butyrats (SB), on maternal responsiveness in a novel T-maze after 2 days (2h/day) of maternal experience 24 h after last pup exposure (N = 7/group). Values represent mean ± SEM latencies in seconds (s) to retrieve each of three test pups from the T-maze. * P < 0.05. Adapted with permission from Stolzenberg, D.S., Stevens, J.S., Rissman, E.F., 2012. Experience-facilitated improvements in pup retrieval: evidence for an epigenetic effect. Hormones and Behavior 62, 128–135, Elsevier Press, New York.