title: Studies on virus attenuation in mouse leukemia.
mesh_terms: D000818:Animals; D009052:Leukemia Virus, Murine / Q000276:immunology*; D007942:Leukemia, Experimental / Q000276:immunology*; D051379:Mice; D014170:Transformation, Genetic; D014774:Virulence; D014779:Virus Replication