title: Opioid receptor binding and its significance.
mesh_terms: D000758:Anesthesia; D005283:Fentanyl / Q000008:administration & dosage* / Q000037:antagonists & inhibitors; D006801:Humans; D010423:Pentazocine / Q000008:administration & dosage*; D011957:Receptors, Opioid / Q000378:metabolism
chemical_list: D011957:Receptors, Opioid; D010423:Pentazocine; D005283:Fentanyl