Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Pelizaeus-Merzbacher disease ?
    ### Response:
    What are the signs and symptoms of Pelizaeus-Merzbacher disease? Pelizaeus-Merzbacher disease is divided into classic and severe (connatal) types. Although these two types differ in severity, their symptoms can overlap. Classic Pelizaeus-Merzbacher disease is the more common type.
    