A) Kaplan-Meier survival curve for Rosa26-SB11;T2/onc low-copy (SB;T2, triangles), Rosa26-SB11 (SB, squares), and T2/onc low-copy (T2, circles) mice. Rosa26-SB11;T2/onc low-copy mice become moribund more rapidly than controls (p<.001, Logrank test). B) Hematoxylin and Eosin (H&E) stained example of a lymphocytic leukemia/lymphoma from a Rosa26-SB11;T2/onc low-copy mouse. Scale bar=50 microns.