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Perkin S, Salanne M, Madden P, Lynden-Bell R.Perkin S, et al.Proc Natl Acad Sci U S A. 2013 Oct 29;110(44):E4121. doi: 10.1073/pnas.1314188110. Epub 2013 Oct 17.Proc Natl Acad Sci U S A. 2013.PMID: 24135005Free PMC article.No abstract available.