Highly selective tritiated ligands and autoradiography have been used to study mu and delta binding sites as well as neutral endopeptidase-24.11 in the dorsal horn of the rat spinal cord. Two weeks and 4 months after dorsal root rhizotomy, both opioid binding sites were dramatically decreased (congruent to 60%). In contrast, the level of neutral endopeptidase-24.11 remained unaltered.
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