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Representative snapshots of active site geometries with different active site NTPs with a closed TL (Sc dC:GTP/ATP/UTP/CTP/dGTP and Tt dT:ATP/GTP/CTP/dATP). The conformation of the dC:UTP is similar to that of dC:CTP, so we did not show it here. Coordination of magnesium ions to surrounding oxygen atoms is indicated with black lines.
