TABLE 2.

Conjugal recombination abilities and spontaneous mutation frequencies of some uvrD mutants used in this study

Strain	uvrD	Conjugal recombination		Spontaneous mutation
		Avg proficiency per 100 donors	Ratioa	Avg frequency	Ratioa
JC13509	+	3.58 ± 2.02	1.00	4.09 × 10−8 ± 2.92 × 10−8	1.00
SS5993	294	7.23 ± 2.17	2.02	NDb	ND
SS3368	cat	ND	ND	2.01 × 10−6 ± 8.27 × 10−7	49.20
SS5704	303	2.02 ± 0.62	0.56	2.78 × 10−8 ± 1.82 × 10−8	0.68
SS5450	701	4.48 ± 3.08	1.25	5.72 × 10−8 ± 6.23 × 10−8	1.40
SS5987	303, 701	2.68 ± 1.05	0.75	5.91 × 10−8 ± 1.51 × 10−8	1.44

^aThe ratio of the conjugal recombination proficiency or spontaneous mutation frequency of each strain to that of the wild type is shown.

^bND, not determined.