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Left panel: Mean (± SEM) number of presses on the active and inactive levers averaged across the last three extinction sessions far all animals separated into eventual SR 21502 dose groups. Right panel: Mean (± SEM) number of presses on the active and inactive levers during the reinstatement test for all groups treated with vehicle or a dose of SR 21502. * represents active lever pressing significantly different from vehicle during reinstatement at p < .01.
