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Iacob RE, Pene-Dumitrescu T, Zhang J, Gray NS, Smithgall TE, Engen JR.Iacob RE, et al. Among authors: engen jr.Proc Natl Acad Sci U S A. 2009 Feb 3;106(5):1386-91. doi: 10.1073/pnas.0811912106. Epub 2009 Jan 21.Proc Natl Acad Sci U S A. 2009.PMID: 19164531Free PMC article.