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Expression of c-Fos protein in ipsilateral nucleus accumbens core and shell after cocaine-self-administration test sessions in groups receiving bilateral or asymmetric vehicle or lidocaine infusions into the medial tip of the subthalamic nucleus (mSTN) or after yoked-saline control sessions (basal). Values are the mean ± SEM number of c-Fos-positive cell counts per 0.1 mm2. * p≤0.05 compared to basal cell counts and # p≤0.05 compared to mSTN vehicle infusion.
