#leukopenia__leucopenia  an abnormal lowering of the white blood cell count
  supertype:  #blood_disease__blooddisease__blood_disorder__blooddisorder  a disease or disorder of the blood
  subtype:  #neutropenia  leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte)
     subtype:  #cyclic_neutropenia  neutropenia that occurs periodically

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