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Number of facial wiping strokes evoked by lemon in Experiment 5. Subjects were pretreated by IP injection of the saline vehicle, the selective m opioid antagonist CTOP (6.0 mg/kg), or the selective k opioid antagonist BNI (9.0 mg/kg) 5 min before receiving an oral infusion AF. Bars depict mean number of wiping strokes; vertical lines show S.E.M.
