title: Puzzles of reproductive physiology.
mesh_terms: D000818:Animals; D002417:Cattle; D006224:Cricetinae; D010064:Embryo Implantation; D004967:Estrogens / Q000502:physiology; D004971:Estrus; D005260:Female; D005306:Fertilization; D005836:Genitalia, Female / Q000502:physiology*; D005837:Genitalia, Male / Q000502:physiology; D006801:Humans; D007986:Luteinizing Hormone / Q000502:physiology; D008297:Male; D051379:Mice; D011247:Pregnancy; D011817:Rabbits; D051381:Rats; D012098:Reproduction; D012737:Sex Factors; D012726:Sexual Behavior, Animal; D012756:Sheep; D013552:Swine
chemical_list: D004967:Estrogens; D007986:Luteinizing Hormone