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Tan GS, Preuss MA, Williams JC, Schnell MJ.Tan GS, et al. Among authors: schnell mj.Proc Natl Acad Sci U S A. 2007 Apr 24;104(17):7229-34. doi: 10.1073/pnas.0701397104. Epub 2007 Apr 16.Proc Natl Acad Sci U S A. 2007.PMID: 17438267Free PMC article.