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Pappu KS, Morey M, Nern A, Spitzweck B, Dickson BJ, Zipursky SL.Pappu KS, et al.Proc Natl Acad Sci U S A. 2011 May 3;108(18):7571-6. doi: 10.1073/pnas.1103419108. Epub 2011 Apr 13.Proc Natl Acad Sci U S A. 2011.PMID: 21490297Free PMC article.