Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) multiple mitochondrial dysfunctions syndrome ?
    ### Response:
    Multiple mitochondrial dysfunctions syndrome is characterized by impairment of cellular structures called mitochondria, which are the energy-producing centers of cells. While certain mitochondrial disorders are caused by impairment of a single stage of energy production, individuals with multiple mitochondrial dysfunctions syndrome have reduced function of more than one stage.
    