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Binding-site residues on the T7 RNA polymerase shown by different PDB structures. A: PDB id 1ARO: A complex of T7 RNA polymerase with T7 Lysozyme. Green: T7 RNA polymerase; Yellow: T7 Lysozyme; Red: protein-binding residues on T7 RNA polymerase; B: PDB id 1QLN: A complex of T7 RNA polymerase with DNA and RNA. Green: T7 RNA polymerase; Orange: DNA; Blue: RNA; Magentas: DNA-binding residues; Brown: RNA-binding residues.
