All

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 A10 Tissues D014024 +
  A10.549 Lymphoid Tissue D008221 +
   A10.549.600 Peyer's Patches D010581 
 A15 Hemic and Immune Systems D006424 +
  A15.382 Immune System D007107 +
   A15.382.520 Lymphatic System D008208 +
    A15.382.520.604 Lymphoid Tissue D008221 +
     A15.382.520.604.600 Peyer's Patches D010581