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Food-maintained behavior after administration of a GHB, b GBL, and c 1,4-BD. Data shown are group means (±1 standard error of the mean) for the number of food pellets earned 2 and 4 h after administration of vehicle (V) or each drug dose (milligrams/kilogram). Data shown are the number of pellets earned in each 2-h period and are not cumulative across time. *p<0.05 represents significant differences between a drug dose and vehicle in pair-wise post hoc tests
