Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) autoimmune lymphoproliferative syndrome ?
    ### Response:
    Autoimmune lymphoproliferative syndrome (ALPS) is an inherited disorder in which the body cannot properly regulate the number of immune system cells (lymphocytes). ALPS is characterized by the production of an abnormally large number of lymphocytes (lymphoproliferation).
    