title: Factor IX antigen by radioimmunoassay in heterozygotes for hemophilia B.
mesh_terms: D000941:Antigens / Q000032:analysis*; D001780:Blood Coagulation Tests; D005164:Factor IX / Q000276:immunology*; D005260:Female; D002836:Hemophilia B / Q000097:blood / Q000276:immunology*; D006579:Heterozygote; D006801:Humans; D011863:Radioimmunoassay
chemical_list: D000941:Antigens; D005164:Factor IX