Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Danon disease ?
    ### Response:
    Danon disease is a type of lysosomal storage disorder. Lysosomes are compartments within the cell that use enzymes to break down large molecules into smaller ones that the cell can use. In Danon disease there is a defect in the wall (membrane) of the lysosome.
    