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RESEARCH ARTICLE Resistant state Sensitive state JAK21 PI3K pathway STAT STAT STATMAPK pathway MAPK pathway AKT ERK STAT ST BAD Liberation of BCL-X BCL-X Pim1 Inhibition of mitochondrial apoptosis Fig. 6. A BADIBCL-X-centric model goveming survival in JAK inhibitor-resistant and cells. In the sensitive state (gray dashed line), suvival is predominantly controlled by canonical JAK signaling-mediated inactivation of BAD at the Ser1 site. In the resistant state (black dashed line), RAS effector pathways ERK and AKT, driven by activating mutations in RAS or other upstream signals, provide compensatory survival signals at the functionally equivalent Ser2 and Ser30 sites, rescuing the efflects of JAK2 irhibition and representing a coalescent signaling node through which survival is orchestrated in JAK2wBIm cells.