Table 1. Bacterial strains used in this study.

Strain	Relevant Genotype	Reference or Construction
AB1157	Wild-type, rec+, ExoV+	Bachmann (1972)
DE586	ΔrecA774::kan	P1.JW2669 × AB1157 to Kanr
DE127	lexA3 (ind−) malB::Tn9	Laboratory collection
DE583	recA730 (E38K) srlD300::Tn10 sulA::Tn5	Laboratory collection
DE584	recA730 sulA::Tn5 lexA3 malB::Tn9	P1.DE202 × DE583 to Cmr, UVs
DE656	ΔrecB1910::dhfr	Laboratory collection
DE657	recA730 srl::Tn10 sulA::Tn5 ΔrecB1910::dhfr	P1.DE656 × DE583 to Tmr
DE393	recAo281 srlD300::Tn10 lexA3 malB::Tn9	Laboratory collection
DE628	recAo281 srlD300::Tn10 ΔmalB732::kan	P1.JW3996 × DE393 to Kanr, UVr
DE189	ΔumuDC::cat	Laboratory collection
DE637	ΔumuDC::cat ΔrecA774::kan	P1.DE586 × DE189 to Kanr,
DE390	ΔrecD744::kan	P1.JW2787 × AB1157 to Kanr
DE595	ΔrecD744::kan recA269::Tn10	P1.DE177 × DE390 to Tcr
DE101	recB268::Tn10	Đermić et al. (2005)
DE589	recB268::Tn10 ΔrecA774::kan	P1.DE586 × DE101 to Kanr
DE590	recQ1803::Tn3	P1.JJC405 × AB1157 to Apr
DE591	recQ1803::Tn3 recB268::Tn10	P1.DE101 × DE590 to Tcr
DE592	recQ1803::Tn3 recB268::Tn10 ΔrecA774::kan	P1.DE586 × DE591 to Kanr
DE110	ΔrecQ::kan	Ivanković and Đermić (2012)
DE623	ΔrecQ::kan recA269::Tn10	P1.DE177 × DE110 to Tcr
RIK174	recBD1080A	Jockovich and Myers (2001)
DE596	recB1080 ΔrecA774::kan	P1.DE586 × RIK174 to Kanr
DE303	recJ2052::Tn10 kan ΔxseA18::amp	Đermić et al. (2006a)
DE457	sbcC201 ΔexoX769::frt ΔsbcB780::frt	Laboratory collection
DE585	sbcC201 ΔexoX769::frt ΔsbcB780::frt ΔxseA758::kan	P1.JW2493 × DE457 to Kanr
DE587	sbcC201 ΔexoX769::frt ΔsbcB780::frt ΔxseA758::kan recA269::Tn10	P1.DE177 × DE585 to Tcr
DE460	sbcC201 ΔexoX769::frt ΔsbcB780::frt ΔxseA18::amp	P1.STL4537 × DE457 to Apr
DE630	sbcC201 ΔexoX769::frt ΔsbcB780::frt ΔxseA18::amp ΔrecD744::kan recA269::Tn10	P1.DE177 × DE624 to Tcr

Kan, kanamycin; Cm, chloramphenicol; Tm, trimetoprim; Tc, tetracycline; Ap, ampicillin; UV, ultraviolet light.