FIG. 2.

Survival of the MC DNA repair-deficient strains to alkylating stress as measured by growth inhibition zones (mm) surrounding paper diffusion disks after exposure to different concentrations of MMS. Repeated experiments (three to five repetitions) demonstrated that the diameter of the growth inhibition zone of each strain fluctuated; however, the strains always displayed the same MMS sensitivity relative to each other. One representative experiment is shown. The strains are as indicated on the figure; the remaining DNA repair-deficient strains listed in Table 1 showed MMS sensitivity comparable to the wild-type (wt) strain.