Figure 2
From: No strings attached: new insights into epithelial morphogenesis
Apical constriction, lateral cell extension, and ingression of endoderm cells. Apical cell constriction with actomyosin flow in prospective endoderm cells Ea and Ep are complemented by cell protrusions extended from neighboring cells MS and P4 in Pohl et al. The combined effect of apical-directed flow and the engulfment of protrusions from neighboring cells removes the constricting cell from the surface, leaving in place a rosette formed by neighboring cells.