Fig. 2. Quantitative gene expression of frataxin using real-time PCR in Caco-2 cells at the indicated days of culture. Fold changes (y-axis) represent the relative expression arbitrarily setting the mRNA frataxin level at day 4 to 1. Indicated values, normalised to ß-glucuronidase mRNA level, are means ±s.d. of three independent experiments.