Figure 7.

Time-lapse imaging of an E15 coronal slice stained with CellTracker Green. The cell (white arrow) migrates tangentially from left to right in the MZ. It bifurcates its leading process and sends a long process into the cortical plate (red asterisk). The leading process extends, retracts, extends, and retracts again over the course of the imaging session before it continues to migrate tangentially toward the right. The behavior noted is consistent with the hypothesis that the migrating cell uses its leading process to search the underlying CP before entering it. In this case, the cell continues to migrate tangentially without entering the CP. Scale bar, 50 μm.