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Robeson MS, King AJ, Freeman KR, Birky CW Jr, Martin AP, Schmidt SK.Robeson MS, et al. Among authors: birky cw jr.Proc Natl Acad Sci U S A. 2011 Mar 15;108(11):4406-10. doi: 10.1073/pnas.1012678108. Epub 2011 Feb 22.Proc Natl Acad Sci U S A. 2011.PMID: 21368117Free PMC article.