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Nickel binding sites of NikR. (a) NikR with nickel ions bound to high-affinity and low-affinity nickel sites. (b) NikR−DNA complex with nickel ions bound to both high-affinity and low-affinity nickel sites. Nickels in high-affinity nickel sites are shown as green spheres, and low-affinity nickel ions are colored blue, with potassium ions colored purple.
