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 A05 Urogenital System D014566 +
  A05.360 Genitalia D005835 +
   A05.360.490 Germ Cells D005854 +
    A05.360.490.690 Ovum D010063 +
     A05.360.490.690.950 Zona Pellucida D015044 
 A11 Cells D002477 +
  A11.284 Cellular Structures D022082 +
   A11.284.295 Extracellular Space D005110 +
    A11.284.295.310 Extracellular Matrix D005109 +
     A11.284.295.310.990 Zona Pellucida D015044 
 A11 Cells D002477 +
  A11.497 Germ Cells D005854 +
   A11.497.497 Ovum D010063 +
    A11.497.497.900 Zona Pellucida D015044 
 A16 Embryonic Structures D004628 +
  A16.631 Ovum D010063 +
   A16.631.900 Zona Pellucida D015044