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Effect of predator odor (red fox urine) on DA transmission in the NAc shell of pre-exposed rats 20 min before (Ringer's solution with 1.2 mm CaCl2). Basal value: NAc shell, 35 ± 3 (means ± SEM in femtomoles per sample). Scores of aversive reactions are also indicated. Results are means ± SEM of the results obtained in at least four rats.
