Mice that were found to have aplastic marrow (unsuccessful transplantation) were excluded from analysis since their death was not related to leukemia (four mice in the Fgf2 +/+ untreated group, one mouse in the Fgf2 -/- untreated group, two mice in the Fgf2 +/+ nilotinib group, and two mice in the Fgf2 -/- nilotinib group). Here, FGF2 is linked to leukemia.