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Poth AG, Colgrave ML, Lyons RE, Daly NL, Craik DJ.Poth AG, et al.Proc Natl Acad Sci U S A. 2011 Jun 21;108(25):10127-32. doi: 10.1073/pnas.1103660108. Epub 2011 May 18.Proc Natl Acad Sci U S A. 2011.PMID: 21593408Free PMC article.