4PCO:
reference: Structures and Energetics of Four Adjacent G.U Pairs That Stabilize an RNA Helix., Gu X, Mooers BH, Thomas LM, Malone J, Harris S, Schroeder SJ, J Phys Chem B. 2015 Oct 22;119(42):13252-61. doi: 10.1021/acs.jpcb.5b06970. Epub , 2015 Oct 12. PMID: 26425937

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