title: Interrelationships of circulating maternal steroid concentrations in third trimester pregnancies. I. C21 steroids: progesterone, 16 alpha-hydroxyprogesterone, 17 alpha-hydroxyprogesterone, 20 alpha-dihydroprogesterone, delta 5-pregnenolone, delta 5-pregnenolone sulfate, and 17-hydroxy delta 5-pregnenolone.
mesh_terms: D006907:17-alpha-Hydroxypregnenolone / Q000097:blood; D004092:20-alpha-Dihydroprogesterone / Q000097:blood; D005260:Female; D012739:Gonadal Steroid Hormones / Q000097:blood*; D006801:Humans; D006908:Hydroxyprogesterones / Q000097:blood; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011284:Pregnenolone / Q000097:blood; D011374:Progesterone / Q000097:blood; D011372:Progestins / Q000097:blood*; D013997:Time Factors
chemical_list: D012739:Gonadal Steroid Hormones; D006908:Hydroxyprogesterones; D011372:Progestins; D004092:20-alpha-Dihydroprogesterone; D006907:17-alpha-Hydroxypregnenolone; D011374:Progesterone; D011284:Pregnenolone