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 A03 Digestive System D004064 +
  A03.556 Gastrointestinal Tract D041981 +
   A03.556.875 Upper Gastrointestinal Tract D041742 +
    A03.556.875.875 Stomach D013270 +
     A03.556.875.875.440 Gastric Mucosa D005753 +
      A03.556.875.875.440.150 Chief Cells, Gastric D019872 
 A10 Tissues D014024 +
  A10.615 Membranes D008566 +
   A10.615.550 Mucous Membrane D009092 +
    A10.615.550.291 Gastric Mucosa D005753 +
     A10.615.550.291.150 Chief Cells, Gastric D019872 
 A11 Cells D002477 +
  A11.436 Epithelial Cells D004847 +
   A11.436.150 Chief Cells, Gastric D019872