Table 4.

pRexAB complements a recBCD defect in E. coli

E. coli strain [plasmid]	Relative values for
	pfu of T4g2*	Survival after UV irradiation†	Frequency of conjugational recombination‡
Wt	0.0005	1	1
recBCD	0.0002	0.2	0.4
[pRexAB]
recBCD	1	0.0073	0.0038

For each study, results are means of at least three experiments, and standard deviation <50% of mean values. 

^*Values given are relative to a plaque titer of 10¹⁰ pfu/ml on JC5519 (recBCD). Wt strain is AB1157. 

^†Cells were irradiated at 25 J/m². Survival of wt strain (V182) was 2.4 × 10⁻¹. recBCD strain is V186. 

^‡Recombination frequency of wt strain (AB1157) was 1.6 × 10⁻³ per viable recipient. recBCD strain is JC5519.