Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) mucopolysaccharidosis type IV ?
    ### Response:
    Mucopolysaccharidosis type IV (MPS IV), also known as Morquio syndrome, is a progressive condition that mainly affects the skeleton. The rate at which symptoms worsen varies among affected individuals.  The first signs and symptoms of MPS IV usually become apparent during early childhood.
    