Movie 1.

Expression of the cell cycle biosensor within the nucleus of NPCs allows the identification of the four cell cycle phases. Left panel – Live imaging movie. The four cell cycle phases are discriminated by the differential expression of the sensor, as well as the movements of nuclei inside the neural tube (Interkinetic Nuclear Movement, INM). Right panel – Segmentation of some analyzed nuclei. Time interval between frames = 5 min. Scale bar = 10 μm.