Related Clues:

• They run when broken
• Mayo maker's supply
• They run when they break
• In vitro items, perhaps
• Cato's eggs
• Brunch staples
• Old eggs?
• Fertility clinic stock
• Eggs, to a biologist
• Would-be chicks
• Omelet ingredient
• Breakfast of centurions?
• Plant gametes, e.g.
• Caviar, basically
• Prods, with 'on'