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Left: Mean ± SEM yawns elicited by intravenous saline (0.0) and ethanol infusions in monkeys with (filled symbols) and without (open symbols) a history of ethanol consumption (n=4 per group). *, p<0.05 versus yawns produced by saline infusion. †, p<0.05 versus ethanol-naïve monkeys at the same ethanol dose. Center, right: Individual subject data for monkeys exposed to both cocaine and ethanol and those exposed only to cocaine, respectively.
