FIG. 7.
Kinetics of induction of the global SOS response in the dnaN159 mutant. β-Galactosidase activity of strains MS117 (relevant genotype, dnaN+ sulA::lacZ′YA::kan) and MS118 (relevant genotype, dnaN159 sulA::lacZ′YA::kan) was assayed as described in Materials and Methods. Cultures were irradiated with UV (25 J/m2) 10 min after the initial β-galactosidase determination (0 min). The values are means ± standard errors of the means (error bars). Not all error bars are large enough to be visible beyond the symbols.