TABLE 6.

β-Galactosidase activities of T1 strains at different stages of growth^a

Strain	Relevant genotype	β-Galactosidase activity (nmol/min/OD600) at the following growth stageb :
		T−1	T0	T1
T1g		167 ± 29	108 ± 39	206 ± 79
A20-86	orfA::lacZ	140 ± 51	5,805 ± 158	8,660 ± 610
A3-41	orfB::lacZ	224 ± 53	3,898 ± 35	5,941 ± 180
A11-79	orfC::lacZ	180 ± 59	4,670 ± 1,060	7,012 ± 650
A1-20	orfD::lacZ	115 ± 24	3,905 ± 714	5,440 ± 124
A20-86-A	orfA::lacZ abrB::erm	7,288 ± 498	5,888 ± 296	7,240 ± 260

^aThe strains were grown in 2216 broth, and β-galactosidase levels were measured as described in Materials and Methods.

^bT₋₁, OD₆₀₀ of ∼1; T₀, OD₆₀₀ of ∼3; T₁, OD₆₀₀ of 4 to 5.