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We have encountered six children with biochemically proven respiratory chain defects, but typical ragged red fibers were not found in all six patients, and only five patients had increased serum lactate levels. Initially, they present with nonspecific features. However, persistent or progressive clinical features or multiple organ involvement eventually led to the diagnosis of respiratory-chain defects in these patients. Mitochondrial respiratory-chain defects should be considered in the differential diagnosis when persistent, progressive features and especially multiple organ involvement occur. 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