Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) mitochondrial complex III deficiency ?
    ### Response:
    Mitochondrial complex III deficiency is a genetic condition that can affect several parts of the body, including the brain, kidneys, liver, heart, and the muscles used for movement (skeletal muscles). Signs and symptoms of mitochondrial complex III deficiency usually begin in infancy but can appear later.
    