SV40 transformed GM04429f (circles) or MRC5-VA (squares) cells were cultured for 48h in 0.5μM 6-TG then treated with H2O2 for 1h. Clonal survival was determined. Solid lines: no 6-TG treatment. Dashed lines: + 6-TG treatment.
Data are the mean ± SD of 4 independent experiments.
Insert. Confirmation of the XP phenotype. Cells not treated with 6-TG were irradiated with UVC at the doses indicated and survival determined as above.