title: Understanding pain: the endorphins and the gate control theory.
mesh_terms: D004723:Endorphins / Q000502:physiology*; D006801:Humans; D010146:Pain / Q000503:physiopathology*; D011957:Receptors, Opioid / Q000502:physiology*
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid