FIG 4.

Relative ionizing radiation sensitivities of spores lacking radical detoxification by SodA or KatX, DNA protection by MrgA, or DNA repair by ExoA plus Nfo or YkoV plus YkoU to X rays (A), protons (B), and high-energy charged Fe ions (C) with (white bars) and without (gray bars) protection by α/β-type SASP. Relative spore sensitivity is expressed as the ratio of the D₁₀ value of spores of each mutant strain to the D₁₀ value of spores of the corresponding reference strain (wild-type or α⁻β⁻) from each irradiation, using data from Fig. 3. Data are averages and standard deviations (n = 3). Actual data values are given above the corresponding columns. Lowercase letters next to the bars denote groups significantly different by ANOVA (P < 0.05).