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Mean (±SEM) time spent in seconds on the saline-paired floor and the MWD-paired floor for each pretreatment drug group (VEH, 10 mg/kg MJN110, 10 mg/kg MJN110+1 mg/kg AM251 during conditioning) during each 15 min test trial. Asterisks indicate a significant difference between the saline and morphine withdrawal paired floors. *p<0.05, ***p<0.001.
