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Mutation rates of the strains in salt-free LB media: a dnaQ+; b dnaQ49. The recA alleles from left to right have increasing RecA* activity. For each recA allele the bars from left to right are the mutation rates of lexA3 [=lexA (Ind-)], lexA+, and lexA51 [=lexA (Def)] derivatives, Thus within each recA background SOS derepression increases from left to right
