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The tolerance of RecA-promoted strand exchange to individual base substitutions compared with previously reported data. Previously reported data on the formation of D-loop in plasmid DNA by RecA-coated oligonucleotides (Table 1 in Ref. 38) are plotted against yields of the strand exchange reaction between oligonucleotides presented in Table 2. Each line corresponds to one of the four possible base substitutions in the *20-mer.
