title: Episodic secretion of human chorionic gonadotropin.
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood* / Q000378:metabolism; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011374:Progesterone / Q000097:blood*; D012016:Reference Values; D013997:Time Factors; D014327:Trophoblasts / Q000378:metabolism
chemical_list: D006063:Chorionic Gonadotropin; D011374:Progesterone