Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Gray platelet syndrome ?
    ### Response:
    What are the signs and symptoms of Gray platelet syndrome? Signs and symptoms usually appear at birth or in early childhood and include low platelet counts, easy bruising, prolonged bleeding, and nose bleeds. Affected individuals often have myelofibrosis and splenomegaly.
    