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Koester HJ, Sakmann B.Koester HJ, et al.Proc Natl Acad Sci U S A. 1998 Aug 4;95(16):9596-601. doi: 10.1073/pnas.95.16.9596.Proc Natl Acad Sci U S A. 1998.PMID: 9689126Free PMC article.