| skeleton |
 |
detected |
| regional | Labeling in the future skull bones (Figs 5abcdef) |
| brain |
|
detected |
| regional | Expression in the brain and in meninges (Fig 5abcdef) |
| future adenohypophysis |
|
detected |
| regional | Expression in the anterior pituitary |
| latero-nasal process |
|
detected |
| regional | In the region of closure between the medial nasal, lateral nasal, and maxillary processes there is expression throughout the mesenchyme and in the epithelia of the oral stem of the Y-shaped nares (Fig 5b). |
| medial-nasal process |
|
detected |
| regional | In the region of closure between the medial nasal, lateral nasal, and maxillary processes there is expression throughout the mesenchyme and in the epithelia of the oral stem of the Y-shaped nares (Fig 5b). |
| maxillary process |
|
detected |
| regional | In the region of closure between the medial nasal, lateral nasal, and maxillary processes there is expression throughout the mesenchyme and in the epithelia of the oral stem of the Y-shaped nares (Fig 5b). Expression in the mesenchyme surrounding the thickened epithelium that fell off progressively in an anterioposterior gradient (Fig 5cde). |
| mandibular process mesenchyme |
|
detected |
| regional | Labeling in the mesenchyme at the tip of the mandibular arch (Fig 5c). In the anterior and middle thirds of the mandibular arch expression decreased progressively in the caudal, aboral mesenchyme and in more posterior arch mesenchyme (Fig 5de). |
| oral region epithelium |
 |
not detected |
| homogeneous | No expression in the mandibular epithelium (Fig 5cdef). |
| tongue |
|
detected |
| regional | Labelling was intense in the anterior two thirds of the tongue anlage (Fig 5d) but absent in the posterior third (Fig 6). |
| 2nd branchial arch mesenchyme |
|
detected |
| | Fig 5f |
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