title: Graffi virus and immunological tolerance in leukaemogenesis.
mesh_terms: D000818:Animals; D007108:Immune Tolerance; D007114:Immunization; D007938:Leukemia / Q000453:epidemiology*; D051379:Mice; D012190:Retroviridae / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000637:transplantation; D014184:Transplantation, Homologous