| 1st branchial arch |
 |
detected |
| regional | Expression is detected in neural-crest-derived cells of the first branchial arch and in somitomere-derived cells. |
| head somite |
 |
detected |
| regional | Expression is detected in neural-crest-derived cells of the first branchial arch and in somitomere-derived cells. |
| mesenchyme |
 |
detected |
| regional | Expression is uniform in all non-notochordal mesoderm except the heart. |
| notochord |
 |
not detected |
| homogeneous | |
| central nervous system |
 |
not detected |
| homogeneous | Expression is absent from the neural tube (Fig6C). |