| Clue | Source | Date |
|---|---|---|
| Certain brain tissue, or what each half of the answers to the starred clues can be | LA Times Daily | 30 Sep 2019 |
| Certain brain tissue, or what each half of the answers to the starred clues can be | The Washington Post | 30 Sep 2019 |
| Certain brain tissue, or what each half of the answers to the starred clues can be | ||
| Some nerve tissue |