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Artavanis-Tsakonas S, Muskavitch MA, Yedvobnick B.Artavanis-Tsakonas S, et al.Proc Natl Acad Sci U S A. 1983 Apr;80(7):1977-81. doi: 10.1073/pnas.80.7.1977.Proc Natl Acad Sci U S A. 1983.PMID: 6403942Free PMC article.