pMSCV-Ires-GFP, pMSCV-FLT3WT-Ires-GFP, and pMSCV-FLT3ITD-Ires-GFP were described previously.21 (link) Ruxolitinib and pacritinib were purchased from Chemietech Inc. Quizartinib, sorafenib, midostaurin, lestaurtinib, crenolanib, gilteritinib, and momelotinib were purchased from AdooQ Bioscience.