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(A) Atenolol (8 mg/kg, i.p.) blocked the pup-induced heart rate increase, with main effects of time and treatment. * indicates the effect of treatment, such that the saline treatment produced a higher heart rate than the atenolol treatment. (B) Atropine (4 mg/kg, i.p.) delayed initial approach to the pup. * indicates p<0.05.
