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A domain substitution experiment was carried out between the structurally related DNA-polymerizing enzymes Polβ and TdT to investigate the region of Polβ required for template utilization. Site-directed mutagenesis and recombinant DNA procedures were used for construction of a gene encoding a chimeric form of the two enzymes and termedTDT POLB , in which the DNA region encoding amino acids (aa)...
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