#zona__zone  (anatomy) any encircling or beltlike structure
  supertype:  zone  an area or region distinguished from adjacent parts by a distinctive feature or characteristic
  subtype:  zona_pellucida  thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
  subtype:  zonule__zonula  small beltlike zone

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