Quantitative real time PCR analysis of expression of Noxa, PUMA, CHOP and TRAIL. HepG2 cells were either infected at m.o.i. 10 or mock infected and after the times indicated examined for the expression of (a) Noxa, (b) PUMA, (c) CHOP and (d) TRAIL by quantitative real time PCR. The relative expression levels of CHOP, Noxa, PUMA and TRAIL were normalized against actin using the comparative CT method (2-∆∆CT method). * indicates p < 0.05.