Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) pseudoxanthoma elasticum ?
    ### Response:
    Pseudoxanthoma elasticum (PXE) is a progressive disorder that is characterized by the accumulation of deposits of calcium and other minerals (mineralization) in elastic fibers. Elastic fibers are a component of connective tissue, which provides strength and flexibility to structures throughout the body.
    