| Clue | Source | Date |
|---|---|---|
| Immature egg cell | New York Times | 31 Oct 2023 |
| Immature egg cell | New York Times | 17 Jan 2021 |
| Ovum before it matures and starts to divide | The Telegraph General Knowledge | 11 Dec 2016 |
| Cell in a 21-Across | New York Times | 23 Aug 2015 |
| Future reproductive cell | The Chronicle of Higher Education | 23 Jan 2015 |
| Future reproductive cell | ||
| Cell in a 21-Across | ||
| Immature egg | ||
| Unmatured egg | ||
| Immature egg, in biology | ||
| Immature egg cell | ||
| Immature egg, in biology | ||
| Immature egg | ||
| Future egg | ||
| Immature egg cell | ||
| An egg develops from it | ||
| Egg-to-be | ||
| Immature cell | ||
| Immature egg | ||
| Immature egg cell | ||
| Future ovum | ||
| Egg-producing cell | ||
| Egg before maturation |