Fig. 5. CYP1A1 mRNA levels (Q-PCR, normalised to GAPDH) following a 24 hour treatment to the BaP/PhIP mixture and a 48 hour recovery period. Data are means ± SEM, n = 3. Significance compared to the DMSO control (one-way ANOVA with Dunnett's post-test; **P ≤ 0.01, ***P ≤ 0.001).