title: Writer's cramp and the endogenous opioid system.
mesh_terms: D004723:Endorphins / Q000502:physiology*; D006225:Hand; D006236:Handwriting; D006801:Humans; D009120:Muscle Cramp / Q000503:physiopathology*; D009270:Naloxone / Q000494:pharmacology
chemical_list: D004723:Endorphins; D009270:Naloxone