Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Myelodysplastic Syndromes ?
    ### Response:
    Your bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting.
    