Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Schwartz Jampel syndrome type 1 ?
    ### Response:
    Schwartz Jampel syndrome type 1 (SJS1) is a genetic disorder that affects bone and muscle development. Signs and symptoms may include muscle weakness and stiffness, abnormal bone development, joint contractures,  short stature, small, fixed facial features, and eye abnormalities (some of which may impair vision).
    