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Effects of P-450mel and rppA mutations on spore survival after UV irradiation. The measure for UV resistance was the frequency of colony formation from spores after different doses of UV irradiation. The S. griseus strains examined were IFO13350 (solid circles), mutant ΔP-450mel (open circles), and ΔrppA (solid triangles). The values are means of the values obtained from four independent experiments.
