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Herr AE, Hatch AV, Throckmorton DJ, Tran HM, Brennan JS, Giannobile WV, Singh AK.Herr AE, et al. Among authors: singh ak.Proc Natl Acad Sci U S A. 2007 Mar 27;104(13):5268-73. doi: 10.1073/pnas.0607254104. Epub 2007 Mar 20.Proc Natl Acad Sci U S A. 2007.PMID: 17374724Free PMC article.