title: Improved separation of antigen-antibody complex in RIA involving ammonium sulfate.
mesh_terms: D000645:Ammonium Sulfate; D000936:Antigen-Antibody Complex / Q000302:isolation & purification*; D006801:Humans; D008550:Melatonin / Q000032:analysis*; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D000936:Antigen-Antibody Complex; D008550:Melatonin; D000645:Ammonium Sulfate