title: A biological clock controlling the estrous cycle of the hamster.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D006224:Cricetinae / Q000502:physiology*; D004971:Estrus; D005260:Female; D006065:Gonadotropins, Pituitary / Q000378:metabolism; D008027:Light; D010060:Ovulation; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology; D011555:Pseudopregnancy; D011830:Radiation Effects; D013997:Time Factors; D014621:Vagina / Q000033:anatomy & histology
chemical_list: D006065:Gonadotropins, Pituitary; D011374:Progesterone