4IQS:
reference: Structural insights of non-canonical U*U pair and Hoogsteen interaction probed with Se atom., Sheng J, Gan J, Soares AS, Salon J, Huang Z, Nucleic Acids Res. 2013 Dec 1;41(22):10476-87. doi: 10.1093/nar/gkt799. Epub 2013, Sep 5. PMID: 24013566

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