title: Time-trend analysis of plasma C-21 steroids in fetal and maternal sheep during the last 18 days of gestation.
mesh_terms: D004092:20-alpha-Dihydroprogesterone / Q000097:blood; D000818:Animals; D003350:Cortodoxone; D005260:Female; D005312:Fetal Blood / Q000378:metabolism*; D005865:Gestational Age; D006908:Hydroxyprogesterones / Q000097:blood; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood*; D011863:Radioimmunoassay; D012756:Sheep; D013256:Steroids / Q000097:blood*
chemical_list: D006908:Hydroxyprogesterones; D013256:Steroids; D004092:20-alpha-Dihydroprogesterone; D011374:Progesterone; D003350:Cortodoxone