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Delidakis C, Artavanis-Tsakonas S.Delidakis C, et al.Proc Natl Acad Sci U S A. 1992 Sep 15;89(18):8731-5. doi: 10.1073/pnas.89.18.8731.Proc Natl Acad Sci U S A. 1992.PMID: 1528887Free PMC article.