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MacLean AL, Filippi S, Stumpf MP.MacLean AL, et al.Proc Natl Acad Sci U S A. 2014 Mar 11;111(10):3883-8. doi: 10.1073/pnas.1317072111. Epub 2014 Feb 24.Proc Natl Acad Sci U S A. 2014.PMID: 24567385Free PMC article.