Figure 7. The UV resistant phenotype depends uniquely on the levels of expression of the phr gene (P3TCK_10673).

Cloning of the phr gene under the arabinose-inducible promoter of pFL190 confers UV-resistance to the cells only when grown with 0.1% L-arabinose. The UV survival plots present the ratio of c.f.u. observed after UV exposure followed by blue-light photoreactivation (red) compared to the non-photoreactivated controls (blue) as described in the materials and methods.