Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Mitochondrial complex IV deficiency ?
    ### Response:
    What are the signs and symptoms of Mitochondrial complex IV deficiency? There are currently 4 known forms of COX deficiency. The range and severity of signs and symptoms can vary widely from case to case. In one form, referred to as the benign infantile mitochondrial myopathy type, symptoms may be limited to the skeletal muscles.
    