. 2007 Oct 26;190(1):428–433. doi: 10.1128/JB.01431-07

TABLE 4.

Neither O3-napF nor interoperator spacing influences expression from O1-lac

Strain	Construct	Spacing^a	Genotype		LacZ sp act (arbitrary units)^b		Repression (fold)
Strain	Construct	Spacing^a	narL	narP	No NO₃⁻	NO₃⁻	Repression (fold)
VJS8886	O3-lac O1-lac	91	+	+	3,290	2,050	1.6
VJS9003	O3-napF O1-lac	91	+	+	2,680	2,210	1.2
VJS9002	O3-napF O1-lac	87	+	+	2,770	2,200	1.3

Interoperator spacing (see Fig. 1).

Strains were cultured overnight in MOPS defined medium with limiting glucose and 0.1 M IPTG.