We subsequently infected the cells with MLL‐AF9‐GFP,[21] HOXA9‐Meis1‐GFP[22] or FLT3‐ITD‐GFP,[23] the most prevalent rearranged fusion or mutant genes widely used for AML model construction (Figure 3A). The gene discussed is FLT3; the disease is acute myeloid leukemia.