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Comparison of the total number of active lever presses at 3 vs. 30 days withdrawal during the Extinction Test for TBOA- or vehicle-infusion into either the PL or IL. Data represents the means ± SEMs of the number of rats indicated in parentheses. *p < 0.05 vs. IL-3 days withdrawal vehicle, illustrating an incubation of drug-seeking. +p < 0.05 vs. IL-30 days withdrawal vehicle.
