title: Difference between mu-receptors in the guinea pig ileum and the mouse vas deferens.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D007082:Ileum / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009130:Muscle, Smooth / Q000378:metabolism*; D009928:Organ Specificity; D011957:Receptors, Opioid / Q000378:metabolism*; D017450:Receptors, Opioid, mu; D013045:Species Specificity; D014649:Vas Deferens / Q000378:metabolism*
chemical_list: D011957:Receptors, Opioid; D017450:Receptors, Opioid, mu