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O'Connor D, Stöhrer G.O'Connor D, et al. Among authors: stohrer g.Proc Natl Acad Sci U S A. 1985 Apr;82(8):2325-9. doi: 10.1073/pnas.82.8.2325.Proc Natl Acad Sci U S A. 1985.PMID: 3887400Free PMC article.