SUMMARY: Conjugational recombination in was investigated by comparing the effects of and mutations on the formation of recombinants in crosses with strains lacking RecBCD enzyme. The results presented reveal that and mutations do not abolish residual recombination in a mutant, and have only a rather modest effect on recombination in strains; in these respects they are quite different from and mutations. The differences between these two groups of genes are discussed in relation to the molecular exchanges needed to produce viable recombinants.


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