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Li X, Chen S, Wang Q, Zack DJ, Snyder SH, Borjigin J.Li X, et al. Among authors: chen s.Proc Natl Acad Sci U S A. 1998 Feb 17;95(4):1876-81. doi: 10.1073/pnas.95.4.1876.Proc Natl Acad Sci U S A. 1998.PMID: 9465110Free PMC article.