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Klarlund JK.Klarlund JK.Proc Natl Acad Sci U S A. 2012 Sep 25;109(39):15799-804. doi: 10.1073/pnas.1210992109. Epub 2012 Sep 10.Proc Natl Acad Sci U S A. 2012.PMID: 23019364Free PMC article.