title: [Electrophoretic analysis and purification of PPDs prepared from culture filtrates employing various media].
mesh_terms: D003470:Culture Media; D004586:Electrophoresis; D009169:Mycobacterium tuberculosis / Q000302:isolation & purification*; D014373:Tuberculin / Q000032:analysis*
chemical_list: D003470:Culture Media; D014373:Tuberculin