Biology — Classification of Blood Cells

digraph BloodCells {
  rankdir=TB;
  node [shape=box, style=rounded];
  Blood -> Plasma;
  Blood -> Cells [label="formed elements"];
  Cells -> RBC [label="erythrocytes"];
  Cells -> WBC [label="leukocytes"];
  Cells -> Platelets;
  WBC -> Granulocytes;
  WBC -> Agranulocytes;
  Granulocytes -> Neutrophils;
  Granulocytes -> Eosinophils;
  Granulocytes -> Basophils;
  Agranulocytes -> Lymphocytes;
  Agranulocytes -> Monocytes;
}