Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Refsum disease, infantile form ?
    ### Response:
    Infantile Refsum disease is the mildest of a group of disorders known as peroxisome biogenesis disorders, Zellweger syndrome spectrum (PBD-ZSS). PBD-ZSS is a group of inherited genetic disorders that damage the white matter of the brain and affect motor movements.
    