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On page 3429 in the 28 May 2015 issue, reference to financial support from the European Research Area NET was omitted. The first sentence of the second paragraph of Acknowledgments should have read: “This study was supported in part by the Israel Science Foundation 757/07 Bikura grant (to S.I. and J.H.) and I-CORE Center grant 41/11 (to S.I.); the WLBH Foundation (S.I. and D.K.); European Research Area NET grant Translational Research in Childhood Acute Lymphoblastic Leukemia (S.I. and M. Stanulla); United States–Israel Binational Science Foundation grant 2011123 (to K.S.C. and A.P.); Israel Science Foundation grant 304/12 (to A.P.); the International Graduate School in Molecular Medicine Ulm (V.M.); German Research Foundation grant SFB1074 (to K.-M.D. and L.H.M.); and the Max-Eder Junior Research Program by the Deutsche Krebshilfe (D.M.S.).” The error has been corrected in the online version, which now differs from the print version.