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Callura JM, Cantor CR, Collins JJ.Callura JM, et al. Among authors: collins jj.Proc Natl Acad Sci U S A. 2012 Apr 10;109(15):5850-5. doi: 10.1073/pnas.1203808109. Epub 2012 Mar 27.Proc Natl Acad Sci U S A. 2012.PMID: 22454498Free PMC article.