GFI1 and myeloid leukemia: Interestingly, we also found that Mx-Cre KD mice injected with MMLV and ENU and later with pIpC developed predominantly lymphoid leukemia (Fig. 3E, F) while mice expressing a low level of Gfi1 still showed the myeloid accumulation leading to myeloid leukemia (Supplemental Fig. 3B, C).