Deletion of Polh does not ameliorate phenotypes caused by knockout of Rev3l.

(A) Genotypes of mouse pups produced by breeding parental Rev3l^-/loxPolh^-/—mice. (B) MEFs with the indicated genotypes were stained with DAPI, and for 53BP1 and γ-H2AX by immunofluorescence as in Fig 2 to detect foci of DNA double-strand breaks. The quantification shows the percentage of cells with >2 53BP1 and γ-H2AX foci in Rev3l^-/loxPolh^+/+, Rev3l^-/loxPolh^-/-, Rev3l^-/ΔPolh^+/+ and Rev3l^-/ΔPolh^-/- MEFs 9 days after AdCre treatment. (C) Survival of primary MEFs as in part B, 120 hr after addition of cisplatin, as measured by ATP content. For panels B& C, Data represent mean ± SEM.