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Coordination sphere of catalytic (Mg2+) and nucleotide (Mg2+) binding magnesium ions in the pol-β/DNA complex with bound dCTP substrate after 10 ns. All the distances within 2 Å are depicted by white dotted lines. WAT2 is the crystallographically observed water. The dCTP:Pα-P10:O3′ distance crucial for nucleotidyl transfer reaction is shown in a green dotted line.
