To examine whether the differences in behavior among the different LSC sub-populations could be due to differences in Cbfb-MYH11 expression, we performed RT-PCR for the fusion gene on sorted leukemia cells and found that that Cbfb-MYH11 expression is similar among each of the sorted sub-population (Supplemental Fig. S8). The gene discussed is MYH11; the disease is leukemia.