6CRM:
reference: A guanine-flipping and sequestration mechanism for G-quadruplex unwinding by RecQ helicases., Voter AF, Qiu Y, Tippana R, Myong S, Keck JL, Nat Commun. 2018 Oct 10;9(1):4201. doi: 10.1038/s41467-018-06751-8. PMID: 30305632

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