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Enzyme activities of complexes I, II, III, IV and V normalized with citrate synthase activity in frontal cortex (A) and angular gyrus (B) in middle‐aged (MA) and PDD. Significantly decreased activity of complex I, II, III and IV is found in frontal cortex and angular gyrus (P‐values between 0.05 and 0.01) in PDD when compared with MA. Student's T‐test *P < 0.05, **P < 0.01, ***P < 0.001. aNo Gaussian distribution (Mann–Whitney test) *P < 0.05, **P < 0.01, ***P < 0.001.
