Movie 10.

MES removal through collective epithelial migration. Confocal live imaging of GFP expression in control E15.5 Myh9^lox/+; Myh10^lox/+; R26^mTmG/+; Crect^Tg/0 secondary palate sagittal section shows normal MES cell movement in trails that incorporate into the nasal epithelium, along with breakage of the trail to form an epithelial island. Images were captured every 15 minutes for 20 hours. Scale bar, 15μm.