FIG 2 .

The absence of Mec1 or Rad53 confers only a modest increase in the UV sensitivity of mutants defective in lesion bypass by template switching. Survival after UV irradiation of isogenic derivative strains of EMY74.7: sml1Δ mec1Δ rad18Δ strain (A), sml1Δ rad53Δ rad18Δ strain (B), sml1Δ mec1Δ rad5Δ strain (C), sml1Δ rad53Δ rad5Δ strain (D), sml1Δ mec1Δ rad51Δ strain (E), and sml1Δ rad53Δ rad51Δ strain (F). Survival curves represent averages of at least three different experiments for each strain. Error bars represent standard deviations of determinations. The absence of error bars in some cases is because the error bars are very small.