| 2R20: reference: The 1.3 A resolution structure of the RNA tridecamer r(GCGUUUGAAACGC): Metal ion binding correlates with base unstacking and groove contraction., Timsit Y, Bombard S, RNA. 2007 Dec;13(12):2098-107. Epub 2007 Oct 16. PMID: 17940138 |
This OCA 
Structure page
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(documentation).