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Chen H, Engelman A.Chen H, et al. Among authors: engelman a.Proc Natl Acad Sci U S A. 1998 Dec 22;95(26):15270-4. doi: 10.1073/pnas.95.26.15270.Proc Natl Acad Sci U S A. 1998.PMID: 9860958Free PMC article.