Selectivity of delta- and kappa-opioid ligands depends on the route of central administration in mice.


The existence of heterodimeric opioid receptors has introduced greater complexity to the in vivo characterization of pharmacological selectivity of agonists by antagonists. Because of the possibility of cooperativity between receptors organized as heterodimers, it is conceivable that selective antagonists may antagonize an agonist bound to a neighboring… (More)

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