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Mean ± SEM number of choices toward the CS odor during the Y-maze test. A pretraining injection of propranolol (20 mg/kg) significantly reduced the learned relative odor preference expressed by pups receiving infusion of ACh and the α1 agonist phenylephrine (α1ago) and the α2 antagonist idazoxan (α2 antago) compared with the control groups. The asterisk represents significant differences from all other groups (p < 0.03). The dotted horizontal line represents a chance line.
