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Belitsky BR, Sonenshein AL.Belitsky BR, et al.Proc Natl Acad Sci U S A. 1999 Aug 31;96(18):10290-5. doi: 10.1073/pnas.96.18.10290.Proc Natl Acad Sci U S A. 1999.PMID: 10468601Free PMC article.