1QES:
reference: Investigation of the structural basis for thermodynamic stabilities of tandem GU wobble pairs: NMR structures of (rGGAGUUCC)2 and (rGGAUGUCC)2., McDowell JA, He L, Chen X, Turner DH, Biochemistry 1997 Jul 1;36(26):8030-8. PMID: 9201950

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