Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) nemaline myopathy ?
    ### Response:
    Nemaline myopathy is a disorder that primarily affects skeletal muscles, which are muscles that the body uses for movement. People with nemaline myopathy have muscle weakness (myopathy) throughout the body, but it is typically most severe in the muscles of the face, neck, and limbs.
    