Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) X-linked adrenoleukodystrophy ?
    ### Response:
    X-linked adrenoleukodystrophy is a genetic disorder that occurs primarily in males. It mainly affects the nervous system and the adrenal glands, which are small glands located on top of each kidney. In this disorder, the fatty covering (myelin) that insulates nerves in the brain and spinal cord is prone to deterioration (demyelination), which reduces the ability of the nerves to relay information to the brain.
    