title: [Radioimmunoassay of 20alpha-hydroxypregn-4-en-3-one].
mesh_terms: D004092:20-alpha-Dihydroprogesterone / Q000097:blood*; D006801:Humans; D008297:Male; D011374:Progesterone / Q000031:analogs & derivatives*; D011863:Radioimmunoassay / Q000379:methods*
chemical_list: D004092:20-alpha-Dihydroprogesterone; D011374:Progesterone