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Relationship between mitochondrion-specific state 3 and state 4 respiration and age in skeletal muscle feed arteries from young, middle-aged, and old subjects. A: mitochondrion-specific complex I (CI) state 3 respiration and age. B: mitochondrion-specific complex I + II (CI+II) state 3 respiration and age. C: mitochondrion-specific complex II (CII) state 3 respiration and age. D: mitochondrion-specific state 4 respiration and age. U CS, units of citrate synthase (CS) activity.
