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Graca L, Le Moine A, Lin CY, Fairchild PJ, Cobbold SP, Waldmann H.Graca L, et al.Proc Natl Acad Sci U S A. 2004 Jul 6;101(27):10122-6. doi: 10.1073/pnas.0400084101. Epub 2004 Jun 24.Proc Natl Acad Sci U S A. 2004.PMID: 15218097Free PMC article.