Fig. 2. GFP⁺ RNECs undergoing interkinetic nuclear migration. (A) A single GFP⁺ RNEC is seen at the edge of the folded explant, 24 hours after infection with a GFP-encoding retrovirus. (B) Snapshots from a time-lapse video recording of a GFP⁺ RNEC undergoing interkinetic nuclear migration along its apico-basal axis. The cell divided horizontally at the apical surface of the neuroepithelium at 16.5 hours. Arrowheads indicate the plane of the cell division, perpendicular to the orientation of the mitotic spindle. Scale bars: 20 µm in A; 40 µm in B.