title: Endogenous peptides and analgesia.
mesh_terms: D000698:Analgesia; D000818:Animals; D004558:Electric Stimulation; D004723:Endorphins / Q000378:metabolism / Q000494:pharmacology / Q000502:physiology*; D006801:Humans; D009474:Neurons / Q000378:metabolism; D010146:Pain / Q000503:physiopathology; D013997:Time Factors
chemical_list: D004723:Endorphins