Fig. 4From: Diagnosis of adult-onset MELAS syndrome in a 63-year-old patient with suspected recurrent strokes – a case reportCytochrome c oxidase/succinate dehydrogenase (COX/SDH) double-labelling histochemistry. Staining for SDH and COX revealed COX negative and SDH hyperreactive muscle fibres indicating mitochondrial dysfunction. Scale bar: 50 μmBack to article page