All

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 A12 Fluids and Secretions D005441 +
  A12.207 Body Fluids D001826 +
   A12.207.152 Blood D001769 +
    A12.207.152.846 Serum D044967 
 A15 Hemic and Immune Systems D006424 +
  A15.145 Blood D001769 +
   A15.145.846 Serum D044967