Mouse Ba/F3 cells transfected with human FLT3-ITD (Ba/F3-ITD) and wild-type FLT3 (FLT3-WT) and the FLT3-ITD-expressing MV4-11 human AML cell line were obtained and cultured as previously described (20 (link)). The FLT3-WT cell lines OCI-AML2 and THP-1 were obtained from the Deutsche Sammlung von Mikroorganismen und Zellkulturen (DSMZ), Braunschweig, GER. Mycoplasma testing was performed every six months with the Mycoplasma Pcr Detection Kit (GeneCopoeia, Rockville, MD).