title: Forms of the cancerigenic principle, cell clones, and Koch's postulates.
mesh_terms: D000818:Animals; D002999:Clone Cells / Q000378:metabolism*; D046508:Culture Techniques; D005455:Fluorescent Antibody Technique; D005796:Genes; D006386:Hemagglutination Tests; D051379:Mice; D009369:Neoplasms / Q000209:etiology; D009858:Oncogenic Viruses; D051381:Rats