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Autoradiographic data from transgenic mice carrying the human Cu/Zn-superoxide dismutase gene demonstrate an increase in μ-opioid receptor concentration in dopaminergic-related areas and the central grey area. The relative potencies of μ-, δ- and κ-opioid receptor agonists to induce antinociception in heterozygous and homozygous superoxide dismutase transgenic mice as well as four inbred strains...
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