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Clore GM, Gronenborn AM.Clore GM, et al.Proc Natl Acad Sci U S A. 1998 May 26;95(11):5891-8. doi: 10.1073/pnas.95.11.5891.Proc Natl Acad Sci U S A. 1998.PMID: 9600889Free PMC article.