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Avshalumov MV, Rice ME.Avshalumov MV, et al.Proc Natl Acad Sci U S A. 2003 Sep 30;100(20):11729-34. doi: 10.1073/pnas.1834314100. Epub 2003 Sep 17.Proc Natl Acad Sci U S A. 2003.PMID: 13679582Free PMC article.