1WP9:
reference: Crystal Structure and Functional Implications of Pyrococcus furiosus Hef Helicase Domain Involved in Branched DNA Processing., Nishino T, Komori K, Tsuchiya D, Ishino Y, Morikawa K, Structure (Camb) 2005 Jan;13(1):143-53. PMID: 15642269

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