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Inhibitor NBC (magenta carbon atoms) bound to maize CK2α (ribbon coloured according to the secondary structure). NBC is sandwiched between hydrophobic residues Val53 and Ile66 on one side, and Met163 and Ile174 on the other side (all shown as solid spheres). A comparison with the similar binding mode of anthraquinone inhibitor quinalizarin [35] (cyan carbon atoms) is shown
