trunk somite |
 |
detected |
| regional | Somitic expression was first seen in the dorsal lip of the myotome where myoblasts initially arise (Fig. 3Ai). As the myotome developed NLRR-1 expression extended ventrally, at first along the anterior side and eventually along the entire width of the somite (Fig. 3Ai-iv). This pattern of expression coincides with the ventral migration of the earliest myoblasts from the dorsal lip of the somite into the myotome. |
branchial arch |
 |
detected |
| regional | Expression was seen in the migrating myoblasts in the branchial arches and hypoglossal chord |
future hindbrain |
 |
detected |
| regional | A longitudinal dissection through the head showed expression was restricted to a strong ventral domain in the basal part of the hindbrain that had a sharp posterior boundary (Fig. 3B, arrowhead). Further stripes of expression extended dorsally from this region along the rhombomere boundaries (Fig. 3B, brackets) |
neural tube |
 |
detected |
| regional | Sections through the anterior neural tube revealed strong expression restricted to a ventral domain close to the floor plate, consistent with expression in motor neurons, with weaker expression spreading dorsally (Figs. 3Aiii-v). Expression was relatively low in the posterior spinal cord (Figs. 3Ai-ii). |