title: Immunologic studies of factor IX (Christmas factor). I. Counterimmunoelectrophoresis method for factor IX antigen.
mesh_terms: D000818:Animals; D000941:Antigens; D003378:Counterimmunoelectrophoresis; D005164:Factor IX / Q000276:immunology* / Q000302:isolation & purification; D002836:Hemophilia B / Q000276:immunology; D006801:Humans; D007106:Immune Sera; D005779:Immunodiffusion; D007122:Immunoelectrophoresis; D007163:Immunosorbent Techniques; D009500:Neutralization Tests; D011234:Precipitins; D011517:Prothrombin Time; D011817:Rabbits
chemical_list: D000941:Antigens; D007106:Immune Sera; D011234:Precipitins; D005164:Factor IX