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Wang X, Ribeiro AA, Guan Z, Abraham SN, Raetz CR.Wang X, et al. Among authors: guan z.Proc Natl Acad Sci U S A. 2007 Mar 6;104(10):4136-41. doi: 10.1073/pnas.0611606104. Epub 2007 Feb 26.Proc Natl Acad Sci U S A. 2007.PMID: 17360489Free PMC article.