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From:
doi: 10.1128/JB.184.13.3753-3755.2002

TABLE 2.

Reversion of chromosomal lac mutants

StrainRelevant genotypeRate of reversiona
FC691F Φ(lacI33-lacZ)0.63 ± 0.22
TP732FC691 ΔrecBCD::red-pae-cI8222.47 ± 0.34
TP734TP732 ΔrecG::tet62002.39 ± 0.69
aRates are given as mean numbers of revertants per day per 109 cells plated ± standard errors of the means for 5 to 12 cultures. Newly arising colonies were counted between 4 and 7 days after plating. Plating conditions were the same as those for the F′ Φ(lacI33-lacZ)-bearing strains, except that greater numbers of cells were plated (1 × 109 to 2 × 109 per plate), and no scavenger cells were used.