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,M-T; Ramos,J; Zhang,X (GENES & DEVELOPMENT, 2010)