Table 2.

Comparisons between leuB⁻ reversion rates and leuB mRNA levels in CP78, CP79, and 78AL

Cells	Condition	leuB mRNA*	MR × 10−9†
CP79 relA−	log	29  ± 5	Not applicable
CP79 relA−	Leu-starved	17  ± 5	0.22  ±  0.1
CP78 relA+	log	30  ± 5	Not applicable
CP78 relA+	Leu-starved	269  ± 60	1.5  ±  0.5
78AL‡	log	213  ± 4	1.0  ±  0.1
78AL	log + IPTG	1,275  ± 175	2.7  ±  0.5
78AL	SP − Leu	63  ± 4	0.9  ±  0.1
78AL	SP − Leu + IPTG	333  ± 32	1.6  ±  0.5

SP, stationary phase. 

^*pg leuB mRNA/μg total RNA. 

^†leuB⁻ mutation rates (MR) ×10⁻⁹ (see Materials and Methods). 

^‡Lacks attenuation and ppGpp-binding sequences.