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On page 3177 of the April 15, 2010, issue Correspondence, there were errors in the authorship and “Acknowledgments” of the letter to the editor. The equal contribution of 2 authors should have appeared as the first sentence beneath the author names and affiliations. The omitted sentence should have read: “C.K. and B.B.Z. contributed equally to this article.” A funder was omitted from the “Acknowledgments.” The second sentence of that section should have read: “C.W.E.S. is an Association for International Cancer Research (AICR) fellow and a European Molecular Biology Organization (EMBO) young investigator, supported in part by Leukaemia and Lymphoma Research, the Kay Kendall Leukaemia Fund, and the Childwick Trust.” The errors were corrected in the online version, which now differs from the print version.