Rabbit vas deferens: a specific bioassay for opioid kappa-receptor agonists.
D000818:Animals; D001681:Biological Assay; D066298:In Vitro Techniques; D008297:Male; D011817:Rabbits; D011957:Receptors, Opioid / Q000032:analysis / Q000187:drug effects*; D014649:Vas Deferens / Q000032:analysis / Q000187:drug effects*
D011957:Receptors, Opioid