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Grus WE, Shi P, Zhang YP, Zhang J.Grus WE, et al. Among authors: zhang yp, zhang j.Proc Natl Acad Sci U S A. 2005 Apr 19;102(16):5767-72. doi: 10.1073/pnas.0501589102. Epub 2005 Mar 24.Proc Natl Acad Sci U S A. 2005.PMID: 15790682Free PMC article.