title: Letter: Cyclic changes in horomones and behavior.
mesh_terms: D001519:Behavior; D004967:Estrogens / Q000097:blood / Q000378:metabolism; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D012739:Gonadal Steroid Hormones / Q000378:metabolism*; D006065:Gonadotropins, Pituitary / Q000378:metabolism*; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008598:Menstruation; D011276:Pregnanediol / Q000097:blood / Q000378:metabolism*; D011374:Progesterone / Q000097:blood / Q000378:metabolism; D012107:Research Design
chemical_list: D004967:Estrogens; D012739:Gonadal Steroid Hormones; D006065:Gonadotropins, Pituitary; D011374:Progesterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D011276:Pregnanediol