Table 1. Activity of β-galactosidase in repressed lysogens.
| Strain (relevant genotype) | β-Galactosidase activity, Miller units |
|---|---|
| NC414 (ΔOL, cro+) | 21 (3.1) |
| NC415 (ΔOL, cro-) | 15 (1.1) |
NC416 ( , cro+) |
4 (1.2) |
NC417 ( , cro-) |
4 (1.3) |
The OL-CI-OR complex increases repression of PR 4-fold. Samples were grown at 30°C and assayed for β-galactosidase activity in early log phase as described in Materials and Methods. The averages of four independent experiments are shown. Standard deviations are given in parentheses.