Illegitimate recombination is suppressed in recB1080 mutant by synergistic activities of RecQ helicase and ExoI exonuclease.

aλ Spi− frequency was calculated by dividing the titer of λ Spi− phage by the titer of total phage.bλ Spi− frequency in bacteria irradiated with 30 Jm−2 dose of UV light. The values are averages of two independent experiments, and are shown in brackets.cIllegitimate recombination frequency was expressed relative to the wild-type strain AB1157. For each UV-irradiated bacterial culture, recombination is expressed in relation to its unirradiated part, and is shown in brackets.