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Gu SG, Pak J, Barberan-Soler S, Ali M, Fire A, Zahler AM.Gu SG, et al.RNA. 2007 Sep;13(9):1492-504. doi: 10.1261/rna.581907. Epub 2007 Jul 24.RNA. 2007.PMID: 17652138Free PMC article.