Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Juvenile Myelomonocytic Leukemia ?
    ### Response:
    Key Points
                    - Juvenile myelomonocytic leukemia is a childhood disease in which too many myelocytes and monocytes (immature white blood cells) are made in the bone marrow.    - Signs and symptoms of juvenile myelomonocytic leukemia include fever, weight loss, and feeling very tired.
    