2G92:
reference: Gene silencing activity of siRNAs with a ribo-difluorotoluyl nucleotide., Xia J, Noronha A, Toudjarska I, Li F, Akinc A, Braich R, Frank-Kamenetsky M, Rajeev KG, Egli M, Manoharan M, ACS Chem Biol. 2006 Apr 25;1(3):176-83. PMID: 17163665

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