Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Giant axonal neuropathy ?
    ### Response:
    Giant axonal neuropathy (GAN) is a neurodegenerative disorder characterized by abnormally large and dysfunctional axons (the specialized extensions of nerve cells that are required for the transmission of nerve impulses). The condition typically appears in infancy or early childhood with severe peripheral motor and sensory neuropathy (affecting movement and sensation in the arms and legs).
    