title: Endogenous opioid activity and the premenstrual syndrome.
mesh_terms: D004723:Endorphins / Q000502:physiology*; D005260:Female; D006801:Humans; D008598:Menstruation; D011293:Premenstrual Syndrome / Q000503:physiopathology*; D013577:Syndrome
chemical_list: D004723:Endorphins