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Contact: Dr. Gregory J. Quirk
University of Puerto Rico, Medical Sciences Campus

Rats Freezing to a Tone (2 of 2)

Caption: Laboratory rats listening to a tone that had been paired with shock. Control rats (top) froze with fear but rats injected with brain-derived neurotrophic factor (bottom) were not afraid, continuing to press a bar for food.

Credit: Dr. Gregory Quirk, University of Puerto Rico

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