Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to facioscapulohumeral muscular dystrophy ?
    ### Response:
    Facioscapulohumeral muscular dystrophy is caused by genetic changes involving the long (q) arm of chromosome 4. Both types of the disease result from changes in a region of DNA near the end of the chromosome known as D4Z4. This region consists of 11 to more than 100 repeated segments, each of which is about 3,300 DNA base pairs (3.
    