TOPICS: Menopause, estrogen, oocytes, primary sexual characteristics, secondary sexual characteristics, vagina, cervix, uterus, epiphyseal growth plate, osteoblast, osteoclast, HDL, LDL, coagulation proteins, antithrombin III, endometrial proliferation, HMG-CoA reductase, cholesterol synthesis, polycystic ovarian syndrome (PCOS), androgen, 17 alpha-hydroxylase, 17,20-lyase, hypothalamic pituitary axis (HPA), luteinizing hormone (LH), theca interna cells, adrenal glands, corpus luteum, anovulatory cycles, progesterone, aromatase deficiency, virilization, aromatase