Abstract
Using the δ-enriched mouse vas deferens and the κ-enriched guinea-pig ileal longitudinal muscle preparations, a large variety of so-called ‘μ, κ, δ and σ’ opioid agonists were tested for their μ, κ and δ properties. Buprenorphine and U50,488H appeared to be the most highly selective agonists for μ and κ opioid receptors, respectively. Most ligands identified as specific agonists are in fact only selective and appear to interact at more than one receptor type.
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