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The amygdala, periaqueductal gray (PAG), and rostral ventromedial medulla (RVM) are critical for the expression of some forms of stress-related changes in pain sensitivity. In barbiturate anesthetized rats, microinjection of agonists for the μ opioid receptor into the amygdala results in inhibition of the tail flick (TF) reflex evoked by radiant heat. We tested the idea that TF inhibition following...
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