Lack of attenuation of UV sensitivity by forced expression of DDB2 in cFLIP-lacking cells. (A) Lack of stimulation of cFLIP expression by forced expression of DDB2 in human VA13 and XP-A cells. Whole cell extracts of infected cells were compared. Cell extracts of cFLIP-transfected cells are also shown as cFLIP protein indicator. (B): Cell sensitivity to UV treatment after Ad-DDB2 virus infection in human VA13 and XP-A cells. The plotted values represent means ± S.D. of three experiments.