1BE5:
reference: Structural studies of a stable parallel-stranded DNA duplex incorporating isoguanine:cytosine and isocytosine:guanine basepairs by nuclear magnetic resonance spectroscopy., Yang XL, Sugiyama H, Ikeda S, Saito I, Wang AH, Biophys J 1998 Sep;75(3):1163-71. PMID: 9726918

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