Table 1.

Expression of the fixR-lacZ promoter mutants

Strain	Relevant characteristic of fixR promoter*	β-Galactosidase activity, Miller units
		Aerobic	Anaerobic
8085	Wild type	501  ±  63	887  ±  8
2020	TA → CG	22  ±  6	684  ±  54
2030	T/TA → G/GG	3  ±  1	4  ±  1
2035	TA/C/C → GG/T/G	1,599  ±  319	2,389  ±  17
2068	TA/C/C → GG/T/G	23  ±  3	610  ±  54

^*See Fig. 1.