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The effect of the cho gene on UV survival. Small droplets of the different strains were deposited on agar plates, after which they were irradiated with the indicated dose of UV light. (A) UV survival of strains in which the uvrC and/or cho have been deleted and which carry either a plasmid vector (pWU5) or a plasmid expressing the UvrC(R42A) protein (pCA179). (B) The same experiment, but all strains now contain an additional lexA51(Def) mutation.
