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Position of the β-hairpin loop in editing (a) and replicating (b) modes. Superposition of the two structures showing the movement of the β-hairpin loop (c). The images were generated using PyMol (DeLano 2002) based on the ternary crystal structure of RB69 DNA polymerase (PDB ID code 3NCI) and editing structure (PDB ID 1CLQ)
