To test the effect of acute Midn deletion on Eμ-Myc driven leukemia, we transplanted bone marrow from Eμ-Myc transgenic or non-transgenic UBC-Cre-ERT2;Midnfl/fl mice (CD45.2) to lethally irradiated WT recipients (CD45.1). This evidence concerns the gene MIDN and leukemia.