title: Plasma levels of apparent free estradiol during pregnancy.
mesh_terms: D004958:Estradiol / Q000097:blood*; D005260:Female; D006801:Humans; D008598:Menstruation; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D011863:Radioimmunoassay
chemical_list: D004958:Estradiol