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Biochemical analysis of muscle showed decreased activities for all respiratory chain enzymes except complex II. Muscle histochemistry revealed diffuse cytochrome c oxidase deficiency. Southern blot analysis of mitochondrial DNA from muscle, liver, and blood showed a heteroplasmic single mitochindrial DNA deletion of 2.4 kb, which removed the genes for cytochrome c oxidase I and II and the transfer ribonucleic acid genes for serine and aspartic acid. Single large-scale deletions in mitochondrial DNA have been associated with Pearson's syndrome, Kearns-Sayre syndrome, and progressive external ophthalmoplegia. This patient's presentation is unusual and suggests an overlap between Pearson's syndrome and Kearns-Sayre syndrome. 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