Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Lambert-Eaton Myasthenic Syndrome ?
    ### Response:
    Lambert-Eaton myasthenic syndrome (LEMS) is a disorder of the neuromuscular junction-the site where nerve cells meet muscle cells and help activate the muscles. It is caused by a disruption of electrical impulses between these nerve and muscle cells. LEMS is an autoimmune condition; in such disorders the immune system, which normally protects the body from foreign organisms, mistakenly attacks the body's own tissues.
    