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Whereas adult cardiomyocytes are highly susceptible to stress, cardiomyocytes in the prenatal heart appear to be rather resistant. To investigate how embryonic cardiomyocytes respond to metabolic stress in vivo, we utilized tissue mosaicism for mitochondrial dysfunction in 13.5dpc mouse hearts. The latter is based on inactivation of the X-linked gene encoding Holocytochrome c synthase (Hccs), which...