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Figure 6.
Figure 6. Stereo view of the Ni^2+-binding site in the
70–80 loop of hK4, superimposed by the equivalent segments of
hK1 in grey. The Ni^2+ is shown as a cyan ball, bound by four
water molecules, Glu77 O^ε, and His25 N^ε2. The Ni^2+ ligand
contacts are depicted as dotted lines. The electron density
accounting for the coordinating water molecules is contoured at
1.0σ and that around nickel at 5.0σ. The most significant
difference between the compared loops is one helical turn in hK4.
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