2ZBK:
reference: Crystal Structure of an Intact Type II DNA Topoisomerase: Insights into DNA Transfer Mechanisms., Graille M, Cladiere L, Durand D, Lecointe F, Gadelle D, Quevillon-Cheruel S, Vachette P, Forterre P, van Tilbeurgh H, Structure. 2008 Mar;16(3):360-70. PMID: 18334211

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