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Acute propranolol treatment reduced freezing behavior on Test 1. Acute propranolol treatment with 2 or 5 mg/kg before Test 1 reduced freezing behavior. PROP 2 = propranolol 2 mg/kg (n = 8); PROP 5 = propranolol 5 mg/kg (n = 8); PROP 10 = propranolol 10 mg/kg (n = 9); VEH = vehicle group (n = 9). *P < 0.05, compared to vehicle group; # P < 0.05, compared to Test 1, all groups.
