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Pre-testing propranolol does not affect fear expression. Rats from Experiment 4 were fear conditioned, and then 2 days later given microinfusions of propranolol (0 μg, n = 5; 0.1 μg, n = 7; 1 μg, n = 6) into the lateral amygdala (LA) immediately before a fear memory test. Propranolol had no effect on fear memory expression. The figure depicts mean freezing levels during the expression test.
