trunk somite |
|
detected |
| regional | Somites posterior to the forelimb level were only weakly labeled, suggesting that Rdh10 induction declines after formation of approximately the first 10 somite pairs. With Respect to differentiation of somitic mesoderm, transverse sections at trunk levels show that only the dorsal edge of the dermomyotome, together with cells surrounding the dorsal spinal cord, were labeled. |
future hindbrain |
|
weak |
| regional | At the mid-hindbrain boundary area. Expressed also in some other regions of the hindbrain. At posterior hindbrain levels, only the dorsal superficial mesenchyme was positive |
future midbrain |
|
weak |
| regional | At the mid-hindbrain boundary area. |
future spinal cord |
|
detected |
| regional | Expressed in some cells in the posterior spinal cord. |
optic vesicle |
|
detected |
| regional | Expressed dorsally. |
otocyst |
|
detected |
| regional | Restricted to cells along the hindbrain surface. |
forelimb bud |
|
detected |
| regional | Labeled cells were seen along the entire proximal margin of the buds. Additionally, Rdh10-expressing cells extended along both the anterior and posterior margins of the growing buds, and labeling was most intense in the posterior area known as the zone of polarizing activity. |
mesenchyme derived from somatopleure |
|
strong |
| | |
mesenchyme derived from splanchnopleure |
|
strong |
| | |
mesonephros |
|
strong |
| regional | Expression was specific to the mesonephric ducts within the intermediate mesoderm. |
rest of foregut mesenchyme |
|
detected |
| regional | Highest labeling was in the mesenchyme surrounding the foregut and dorsal aortae. |
dorsal aorta |
|
detected |
| regional | High labeling was in the mesenchyme surrounding the dorsal aortae, dorsally to the atrial chambers of the developing heart. |
foregut |
|
strong |
| regional | Discrete areas of foregut endoderm also expressed Rdh10, including at the level of the second branchial arch. |
midgut |
|
detected |
| | At more posterior levels, section analysis clearly showed endoderm-specific expression at the prospective stomach level. |