1D9H:
reference: Structural origins of the exonuclease resistance of a zwitterionic RNA., Teplova M, Wallace ST, Tereshko V, Minasov G, Symons AM, Cook PD, Manoharan M, Egli M, Proc Natl Acad Sci U S A 1999 Dec 7;96(25):14240-5. PMID: 10588690

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