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Rearrangement of medium spiny neurons (MSNs) after chronic administration of WIN 55,212-2. Sholl analysis-derived distribution of MSNs in nucleus accumbens between consecutive 20-µm-spaced concentric spheres. Chronic administration of WIN resulted in a significant decrease in the amount of dendritic branches proximal to the soma only in adult rats, *p < 0.05. Means and standard error of mean are plotted
