Leukemic Sca1‐Lmo2 + nu/nu mice (n = 8/10) had enlarged spleens and succumbed to a highly disseminated form of leukemia that infiltrated both hematopoietic and non‐hematopoietic tissues (Fig 4B and C; Appendix Fig S8A). The gene discussed is LMO2; the disease is leukemia.