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Elsing A, Burgert HG.Elsing A, et al. Among authors: burgert hg.Proc Natl Acad Sci U S A. 1998 Aug 18;95(17):10072-7. doi: 10.1073/pnas.95.17.10072.Proc Natl Acad Sci U S A. 1998.PMID: 9707602Free PMC article.