title: Investigation of protoplasmic extracts of tubercle bacilli as skin test antigens.
mesh_terms: D000818:Animals; D000941:Antigens; D002498:Centrifugation; D011232:Chemical Precipitation; D002845:Chromatography; D003593:Cytoplasm / Q000276:immunology*; D006168:Guinea Pigs; D006801:Humans; D008722:Methods; D009169:Mycobacterium tuberculosis / Q000276:immunology*; D014374:Tuberculin Test
chemical_list: D000941:Antigens