title: Substance P and opiate receptors.
mesh_terms: D000109:Acetylcholine / Q000037:antagonists & inhibitors; D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002415:Cats; D006710:Homocysteine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects*; D013126:Spinal Nerve Roots / Q000187:drug effects* / Q000502:physiology; D013373:Substance P / Q000037:antagonists & inhibitors / Q000494:pharmacology*
chemical_list: D011957:Receptors, Opioid; D006710:Homocysteine; D013373:Substance P; D009270:Naloxone; D000109:Acetylcholine