Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Multiple mitochondrial dysfunctions syndrome ?
    ### Response:
    Multiple mitochondrial dysfunctions syndrome (MMDS) is a severe condition that affects the energy-producing structures of cells (called the mitochondria). Signs and symptoms of this condition generally develop early in life and may include encephalopathy, hypotonia (poor muscle tone), seizures, developmental delay, failure to thrive, lactic acidosis and a variety of other health problems.
    