Fig. 7. The mitochondrial iron chelator mitigates the UVA-induced loss of ATP in FRDA fibroblasts. Human fibroblasts (a) and mouse fibroblasts (b) were treated as in Fig. 6 and cellular ATP production was measured 2 h post-treatment. Results from 3–5 independent experiments are expressed as means ± SD of percentage ATP production compared to untreated control cells. * significantly different (p < 0.05) from irradiated control cells. † significantly different (p < 0.05) from corresponding sample irradiated with UVA alone.