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On page 4180 in the 15 November 2012 issue, there is an error in the Acknowledgments. The second sentence of the Acknowledgments reads, “This work was supported by the Intramural National Institute of Allergy and Infectious Diseases, National Institutes of Health program, and the National Cancer Institute, National Institutes of Health (contract HHSN261200800001E and R01 AI-084836, M.P.).” The sentence should have read, “This work was supported by the Intramural National Institute of Allergy and Infectious Diseases, National Institutes of Health program, and the National Cancer Institute, National Institutes of Health (contract HHSN261200800001E, R37 AI-066998 [G.S.], and R01 AI-084836 [M.P.]).”