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Shelburne SA 3rd, Keith D, Horstmann N, Sumby P, Davenport MT, Graviss EA, Brennan RG, Musser JM.Shelburne SA 3rd, et al. Among authors: graviss ea.Proc Natl Acad Sci U S A. 2008 Feb 5;105(5):1698-703. doi: 10.1073/pnas.0711767105. Epub 2008 Jan 29.Proc Natl Acad Sci U S A. 2008.PMID: 18230719Free PMC article.