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Jordan KE, Brannon EM.Jordan KE, et al. Among authors: brannon em.Proc Natl Acad Sci U S A. 2006 Feb 28;103(9):3486-9. doi: 10.1073/pnas.0508107103. Epub 2006 Feb 21.Proc Natl Acad Sci U S A. 2006.PMID: 16492785Free PMC article.