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(A) Orthogonal views of the crystal structure of ArdK bound to DR DNA. One of the subunits of ArdK is coloured in green and the other in cyan. The DD and HTH domains and the secondary structure elements of ArdK are labeled. Location of the DNA direct repeats is shown by arrows. (B) Recognition of specific bases in the operator. Hydrogen bonds between ArdK and the DNA are shown by black arrows. (C) 2Fo–Fc electron density map of the ArdK HTHB DNA interaction region.
