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Striatal regional differences along medial to lateral gradient. Basal DA (a, absolute values ± SEM) and cocaine-activated DA levels (b, percentage of mean of three points before cocaine ± SEM). Subdivisions were the medial two, central two, and lateral two trajectories, independent of depth. *Significantly different from the other two groups atp < 0.05, numbers inparentheses indicate number of observations.M, Medial; C, central; L,lateral.
