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 neuromuscular junction is the site where nerve cells meet muscle cells and help activate the muscles. This syndrome occurs when antibodies interfere with electrical impulses between the nerve and muscle cells.
    