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The activity levels of Complex I, III, IV and V exposed to irradiation compared with the activity levels in sham-irradiated mitochondria. The changes in the activity levels of respiratory chain complexes I, IV and V first declined (after 4 weeks), and then peaked at 8 weeks. The activity level of respiratory chain complex III did not peak until 24 weeks after irradiation. Three independent biological replicates were used. *P < 0.05.
