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Association between total active-lever responses during extinction and the density of asymmetric (A) and symettric (B) synpases onto dendrites averaged over the three regions of the nucleus accumbens core for each subject. n = 3 (saline, sedentary and exercise) or 4 (nicotine, sedentary and exercise). Exer, exercise; Nic, nicotine; Sal, saline; Sed, sedentary.
