1XUX:
reference: Structural rationalization of a large difference in RNA affinity despite a small difference in chemistry between two 2'-O-modified nucleic acid analogues., Pattanayek R, Sethaphong L, Pan C, Prhavc M, Prakash TP, Manoharan M, Egli M, J Am Chem Soc. 2004 Nov 24;126(46):15006-7. PMID: 15547979

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