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Nogales J, Gudmundsson S, Knight EM, Palsson BO, Thiele I.Nogales J, et al. Among authors: gudmundsson s.Proc Natl Acad Sci U S A. 2012 Feb 14;109(7):2678-83. doi: 10.1073/pnas.1117907109. Epub 2012 Jan 30.Proc Natl Acad Sci U S A. 2012.PMID: 22308420Free PMC article.