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Longo-Guess CM, Gagnon LH, Cook SA, Wu J, Zheng QY, Johnson KR.Longo-Guess CM, et al. Among authors: gagnon lh.Proc Natl Acad Sci U S A. 2005 May 31;102(22):7894-9. doi: 10.1073/pnas.0500760102. Epub 2005 May 19.Proc Natl Acad Sci U S A. 2005.PMID: 15905332Free PMC article.