MES epithelial islands persist upon loss of apoptosis. Confocal live imaging of GFP expression in E15.5 Baxlox/lox; Bak-/-; R26mTmG/+; CrectTg/0 secondary palate sagittal section shows the lack of MES cell removal of an island by apoptosis. Arrowheads indicate membrane blebbing that still occurs in mutants. Images were captured every 15 minutes for 20 hours. Scale bar, 15μm.