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Staining of c-fos-like-immunoreactivity (CFIR) in neurones was used to study neuronal activation within subdivisions of periaqueductal gray (PAG), and in locus coeruleus and ventral tegmental area during opiate withdrawal in awake and anaesthetised, morphine-dependent rats. The number of CFIR containing neurones was significantly increased during naloxone-precipitated withdrawal in lateral and ventrolateral,...
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