title: An endorphinergic, centrifugal substrate of pain modulation: recent findings, current concepts, and complexities.
mesh_terms: D004558:Electric Stimulation; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009294:Narcotics / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology*; D013116:Spinal Cord / Q000187:drug effects
chemical_list: D004723:Endorphins; D009294:Narcotics