4KTZ:
reference: Mutants of phage bIL67 RuvC with enhanced Holliday junction binding selectivity and resolution symmetry., Green V, Curtis FA, Sedelnikova S, Rafferty JB, Sharples GJ, Mol Microbiol. 2013 Jul 25. doi: 10.1111/mmi.12343. PMID: 23888987

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