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Escalante AA, Cornejo OE, Freeland DE, Poe AC, Durrego E, Collins WE, Lal AA.Escalante AA, et al. Among authors: lal aa.Proc Natl Acad Sci U S A. 2005 Feb 8;102(6):1980-5. doi: 10.1073/pnas.0409652102. Epub 2005 Jan 31.Proc Natl Acad Sci U S A. 2005.PMID: 15684081Free PMC article.