Loss of apoptosis does not disrupt collective epithelial migration. Confocal live imaging of GFP expression in E15.5 Baxlox/lox; Bak-/-; R26mTmG/+; CrectTg/0 secondary palate sagittal section shows collective MES cell movement in trails. Arrowheads indicate trails in the movie. The gamma setting for this movie is adjusted to 1.5 to better visualize trails without saturating signal at the nasal epithelium. Images were captured every 15 minutes for 20 hours. Scale bar, 20μm.