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Keck W, Glauner B, Schwarz U, Broome-Smith JK, Spratt BG.Keck W, et al. Among authors: glauner b.Proc Natl Acad Sci U S A. 1985 Apr;82(7):1999-2003. doi: 10.1073/pnas.82.7.1999.Proc Natl Acad Sci U S A. 1985.PMID: 3920658Free PMC article.