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Activities of mitochondrial Complex I, IV and V. A: Complex I (NADH:ubiquinone reductase) activity assessed by diminution rate of NADH level (nmol/min/cell). B: Complex IV (cytochrome c oxidase) respiration measured with TMPD and ascorbate as substrates in the presence of antimycin A. C: Cellular ATP levels measured by luciferase assay. Data are expressed as the mean±S.D. of nine independent experiments. (**p<0.01; n.s., not significant).
