| branchial arch |
 |
detected |
| | Also seen in ventral midline structures. |
| forelimb bud |
 |
detected |
| | Also seen in ventral midline structures. |
| future forebrain |
 |
detected |
| | Also seen in ventral midline structures. |
| fronto-nasal process |
 |
detected |
| | Also seen in ventral midline structures. |
| arterial system |
 |
detected |
| | Authors report expression in aortic arches. |
| heart |
 |
detected |
| | Also seen in ventral midline structures. |