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Histological analysis of probe placements in the ventral striatum of male mice pretreated with BFNA. Numbers beside each slice represent the AP position relative to bregma (mm). The heavy dashed line indicates the border of the ventral striatum. Probe length is 1 mm. A. 5 mg/kg morphine, n = 14. B. 2 g/kg ethanol, n = 11.
