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(a) Mean (±SEM) freezing by rats in response to the CS during extinction training in Experiment 1. (b) Mean (±SEM) CS-elicited freezing by rats during test in Experiment 1. Rats had been injected with vehicle (n=12), or 5 (n=12), 10 (n=13), or 20 (n=12) ng/g body weight FGF2 after extinction training.
