title: Endogenous pain control mechanisms.
mesh_terms: D005246:Feedback; D006801:Humans; D008784:Methysergide / Q000627:therapeutic use; D008881:Migraine Disorders / Q000188:drug therapy / Q000503:physiopathology*; D010146:Pain / Q000503:physiopathology
chemical_list: D008784:Methysergide