title: Renal excretion of endogenous opioids.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002855:Chromatography, Thin Layer; D006168:Guinea Pigs; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009294:Narcotics / Q000378:metabolism / Q000494:pharmacology / Q000652:urine*; D011957:Receptors, Opioid / Q000378:metabolism
chemical_list: D009294:Narcotics; D011957:Receptors, Opioid