Ogawara et al. developed a peculiar model of IDH-dependent leukemia, in which mice were transplanted with NPM1+/− hematopoietic stem/progenitor cells co-transduced with four mutant genes (NPMc, IDH2-R140Q, DNMT3A-R882H, and FLT3-ITD) [105]. The gene discussed is FLT3; the disease is leukemia.