title: A direct radioiodination technique for the radioimmunoassay of 17alpha-ethynyl, 17beta-hydroxy-4-estren-3-one.
mesh_terms: D002855:Chromatography, Thin Layer; D003429:Cross Reactions; D004305:Dose-Response Relationship, Drug; D007457:Iodine Radioisotopes; D007553:Isotope Labeling / Q000379:methods; D008832:Microchemistry; D009640:Norethindrone / Q000032:analysis* / Q000276:immunology; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D007457:Iodine Radioisotopes; D009640:Norethindrone