1EG6:
reference: Guanine specific binding at a DNA junction formed by d[CG(5-BrU)ACG](2) with a topoisomerase poison in the presence of Co(2+) ions., Thorpe JH, Hobbs JR, Todd AK, Denny WA, Charlton P, Cardin CJ, Biochemistry 2000 Dec 12;39(49):15055-61. PMID: 11106483

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