All

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 A16 Embryonic Structures D004628 +
  A16.254 Embryo D004622 +
   A16.254.403 Fetal Membranes D005321 +
    A16.254.403.473 Chorion D002823 +
     A16.254.403.473.200 Chorionic Villi D002824 
 A16 Embryonic Structures D004628 +
  A16.759 Placenta D010920 +
   A16.759.189 Chorionic Villi D002824