1Q8R:
reference: The structure of Escherichia coli RusA endonuclease reveals a new Holliday junction DNA binding fold., Rafferty JB, Bolt EL, Muranova TA, Sedelnikova SE, Leonard P, Pasquo A, Baker PJ, Rice DW, Sharples GJ, Lloyd RG, Structure (Camb) 2003 Dec;11(12):1557-67. PMID: 14656440

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