3ZQN:
reference: Structural basis for DNA recognition and loading into a viral packaging motor., Buttner CR, Chechik M, Ortiz-Lombardia M, Smits C, Ebong IO, Chechik V, Jeschke G, Dykeman E, Benini S, Robinson CV, Alonso JC, Antson AA, Proc Natl Acad Sci U S A. 2011 Dec 29. PMID: 22207627

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