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Morona JK, Morona R, Paton JC.Morona JK, et al.Proc Natl Acad Sci U S A. 2006 May 30;103(22):8505-10. doi: 10.1073/pnas.0602148103. Epub 2006 May 17.Proc Natl Acad Sci U S A. 2006.PMID: 16707578Free PMC article.