Figure 6.

Comparison of embryonic dorsal closure and imaginal thorax closure. Embryonic dorsal closure proceeds through the stretching of epidermal cells (green) and the simultaneous contraction of the apical ends of amnioserosa cells (orange). Amnioserosa and epidermis remain continuous during the whole process and keep contact with the basal lamina (red). Once dorsal closure is concluded, amnioserosa cells delaminate and undergo apoptosis (black). During imaginal thorax closure, imaginal cells (blue) detach from the basal lamina (red) and crawl over the larval cells (purple), emitting filopodia. Larval cells delaminate from the borders of the larval sheet and undergo apoptosis (black) once the imaginal cells leave them behind.