Phosphorylation status of MAPK/Stat3/Stat5/Akt in leukemia cells. Western blot analysis of leukemia cells from Cbfb^+/56m; Tg(Mx1-Cre)/KIT^D816Y (MxCre-CM + KIT mut) mice and Cbfb^+/56m; Tg(Mx1-Cre) mice (MxCre-CM) and human ME-1 cells for the indicated proteins and their phosphorylated products.