| 1st branchial arch |
 |
detected |
| graded | Stronger levels are in the distal mesenchyme. |
| 2nd branchial arch |
 |
detected |
| graded | Stronger levels are in the distal mesenchyme. |
| neural tube |
 |
detected |
| regional | Expression is in the dorsal neural tube, the anterior boundary regresses posteriorly. |
| trunk somite |
 |
detected |
| regional | The anterior limit is at the boundary between somite 3/4. |
| forelimb bud mesenchyme |
 |
detected |
| regional | Expression extends distally through the progress zone. |