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Nouspikel T, Lalle P, Leadon SA, Cooper PK, Clarkson SG.Nouspikel T, et al. Among authors: clarkson sg.Proc Natl Acad Sci U S A. 1997 Apr 1;94(7):3116-21. doi: 10.1073/pnas.94.7.3116.Proc Natl Acad Sci U S A. 1997.Retraction in: Proc Natl Acad Sci U S A. 2006 Dec 19;103(51):19606. doi: 10.1073/pnas.0609759103PMID: 9096355Free PMC article.Retracted.