1MV1:
reference: Molecular recognition in purine-rich internal loops: thermodynamic, structural, and dynamic consequences of purine for adenine substitutions in 5'(rGGCAAGCCU)2., Znosko BM, Burkard ME, Krugh TR, Turner DH, Biochemistry 2002 Dec 17;41(50):14978-87. PMID: 12475247

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