| future midbrain floor plate |
 |
strong |
| | |
| gut |
 |
strong |
| | |
| visceral organ system |
 |
strong |
| regional | Expression is detected in the liver primordium. |
| notochord |
 |
weak |
| regional | Expression is detected in the posterior notochord and posterior floor plate of the neural tube |
| neural tube floor plate |
 |
weak |
| regional | Expression is detected in the posterior notochord and posterior floor plate of the neural tube |