All

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 A16 Embryonic Structures D004628 +
  A16.254 Embryo D004622 +
   A16.254.425 Germ Layers D005855 +
     A16.254.425.273 Ectoderm D004475 
     A16.254.425.407 Endoderm D004707 
     A16.254.425.660 Mesoderm D008648 +