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Xie L, Bourne PE.Xie L, et al. Among authors: bourne pe.Proc Natl Acad Sci U S A. 2008 Apr 8;105(14):5441-6. doi: 10.1073/pnas.0704422105. Epub 2008 Apr 2.Proc Natl Acad Sci U S A. 2008.PMID: 18385384Free PMC article.