title: Cross reactivity in theophylline RIA kit decreased.
mesh_terms: D003429:Cross Reactions; D006801:Humans; D011863:Radioimmunoassay / Q000379:methods; D013806:Theophylline / Q000031:analogs & derivatives / Q000097:blood*
chemical_list: D013806:Theophylline; C030093:8-chlorotheophylline