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Evolutionary trees displaying the relationships (a) of PolI_G20c to PolI_Tth15-6 and deposited sequences encoding DNA polymerases I from thermophilic bacteriophages and (b) of ExnV1 to the 3′–5′ exonuclease domain in the closest related DNA polymerase I sequences. The trees are presented to scale, with branch lengths measured in number of substitutions per site. The trees were prepared with MEGA version X and were graphically edited with iTOL and Microsoft PowerPoint.
