All

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 A16 Embryonic Structures D004628 +
  A16.254 Embryo D004622 +
   A16.254.403 Fetal Membranes D005321 +
     A16.254.403.147 Allantois D000482 
     A16.254.403.277 Amnion D000650 
     A16.254.403.473 Chorion D002823 +
     A16.254.403.981 Yolk Sac D015017