title: A codeine radioimmunoassay exhibiting insignificant cross-reactivity with morphine.
mesh_terms: D003061:Codeine / Q000031:analogs & derivatives / Q000276:immunology*; D003429:Cross Reactions; D009020:Morphine / Q000276:immunology*; D011863:Radioimmunoassay
chemical_list: D009020:Morphine; D003061:Codeine