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Geometry of (A) F:dTTP (PDB ID 3QEP), (B) F:dCTP (PDB ID 3QEI), and (C) F:dGTP (PDB ID 3QES) at the active site of the B-family pol RB69.43 Pol residues A567, G568 and A569 probing the nascent base pair from the minor groove side are depicted with carbon atoms colored in magenta (similar for F:dCTP and F:dGTP) and selected water molecules are cyan (F:dTTP).
