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Fig. 5. Subcellular localisation of frataxin, VDAC-1 and citrate synthase in proliferating and differentiated Caco-2 cells. The enrichment of mitochondria in membrane/organelle fractions was checked by the use of VDAC-1 and citrate synthase mitochondrial markers. Membrane/organelle-enriched fractions contain mitochondria (M.F.), while the cytoplasmic fraction (C.F.) does not.