2XRO:
reference: Crystal structure of TtgV in complex with its DNA operator reveals a general model for cooperative DNA binding of tetrameric gene regulators., Lu D, Fillet S, Meng C, Alguel Y, Kloppsteck P, Bergeron J, Krell T, Gallegos MT, Ramos J, Zhang X, Genes Dev. 2010 Nov 15;24(22):2556-65. PMID: 21078819

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