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Effect of repeated GZ-793A on METH self-administration and food-maintained responding. Top panel Relative to saline control, repeated GZ-793A (15 mg/kg; s.c.) treatment significantly decreased METH infusions, without the development of tolerance, n=4/group. Bottom panel Repeated GZ-793A (15 mg/kg; s.c.) treatment significantly increased pellets earned, n=6/group. Asterisk denotes significance relative to saline control
