4BIJ:
reference: Large terminase conformational change induced by connector binding in bacteriophage T7., Dauden MI, Martin-Benito J, Sanchez-Ferrero JC, Pulido-Cid M, Valpuesta JM, Carrascosa JL, J Biol Chem. 2013 Apr 30. PMID: 23632014

This OCA Structure page
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