title: Programmed and aleatory elements in thymic leukemia.
mesh_terms: D000818:Animals; D007942:Leukemia, Experimental / Q000209:etiology / Q000235:genetics; D051379:Mice; D008815:Mice, Inbred Strains; D010641:Phenotype; D011995:Recombination, Genetic; D012190:Retroviridae; D013945:Thymoma / Q000209:etiology / Q000235:genetics*; D013997:Time Factors