Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Acquired pure red cell aplasia ?
    ### Response:
    Acquired pure red cell aplasia (PRCA) is a bone marrow disorder characterized by a reduction of red blood cells (erythrocytes) produced by the bone marrow. Signs and symptoms may include fatigue, lethargy, and/or abnormal paleness of the skin (pallor) due to the anemia the caused by the disorder.
    