mRNA levels of genes coding for subunits in the electron transport chain. Relative expression levels of genes coding for subunits of the electron transport chain in healthy controls and diabetic patients before and after treatment with rosiglitazone for 90 days. (a) NDUFS4 in complex I, (b) SDHA in complex II, (c) cytochrome b in complex III, (d) COX Vb in complex III, (e) COX II in complex IV. Bars represents mean and error bars SEM. * = p < 0.05, ** = p < 0.01.