1GL7:
reference: The bacterial conjugation protein TrwB resembles ring helicases and F1-ATPase., Gomis-Ruth FX, Moncalian G, Perez-Luque R, Gonzalez A, Cabezon E, de la Cruz F, Coll M, Nature 2001 Feb 1;409(6820):637-41. PMID: 11214325

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