title: Neurobiological substrates of drug self-administration.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D004745:Enkephalins / Q000008:administration & dosage; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D009498:Neurotoxins / Q000494:pharmacology; D011957:Receptors, Opioid / Q000502:physiology*; D012054:Reinforcement, Psychology; D012646:Self Administration; D011984:Sensory Receptor Cells / Q000502:physiology
chemical_list: D004745:Enkephalins; D009498:Neurotoxins; D011957:Receptors, Opioid