Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) centronuclear myopathy ?
    ### Response:
    Centronuclear myopathy is a condition characterized by muscle weakness (myopathy) and wasting (atrophy) in the skeletal muscles, which are the muscles used for movement. The severity of centronuclear myopathy varies among affected individuals, even among members of the same family.
    