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Mitochondrion-specific superoxide levels in skeletal muscle feed arteries from young, middle-aged, and old subjects and relationship between mitochondrion-specific superoxide levels and age. A: mitochondrion-specific superoxide levels in young, middle-aged, and old subjects. AU, arbitrary units. Values are means ± SE; n = 9 young, 8 middle-aged, and 10 old subjects. *Significantly different from old (P < 0.05). B: mitochondrion-specific superoxide levels and age.
