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Boultwood J, Rack K, Kelly S, Madden J, Sakaguchi AY, Wang LM, Oscier DG, Buckle VJ, Wainscoat JS.Boultwood J, et al.Proc Natl Acad Sci U S A. 1991 Jul 15;88(14):6176-80. doi: 10.1073/pnas.88.14.6176.Proc Natl Acad Sci U S A. 1991.PMID: 1829836Free PMC article.