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On page 1051 in the 20 January 2011, issue, a National Institutes of Health grant was omitted from the first sentence in “Acknowledgments.” The sentence reads, “This work was supported in part by National Institutes of Health Grant PO1CA100265-01A1 (Project 5), European Commission LSHB-CT-2004-503319 (Allostem Project), the Gabriella Rich Center for Transplantation Biology Research, and Mrs E. Drake.” The sentence should have read: “This work was supported in part by National Institutes of Health Grants PO1CA100265-01A1 (Project 5) and R01AI43542, European Commission LSHB-CT-2004-503319 (Allostem Project), the Gabriella Rich Center for Transplantation Biology Research, and Mrs E. Drake.”