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Atamna H, Boyle K.Atamna H, et al.Proc Natl Acad Sci U S A. 2006 Feb 28;103(9):3381-6. doi: 10.1073/pnas.0600134103. Epub 2006 Feb 21.Proc Natl Acad Sci U S A. 2006.PMID: 16492752Free PMC article.