Related Clues:

• Some germ cells
• Oocytes, eventually
• Eggs (Latin)
• Some gametes
• Fertilization targets
• Fertility clinic topic
• Latin 6-Down
• Half of a zygote
• Romans' caviar
• Egg without a shell
• They grow when fertilized
• It may go down a tube
• 57-Across, to Brutus
• In vitro items, perhaps
• Ovoid objects