Fig. 3a, b.

Correction of cell mixing by a fence of increased cortical tension. a The actomyosin cable at the boundary interface could continuously generate cortical tension (small red arrows). These forces could be overridden by forces produced by cortex stiffening during the division of a boundary cell (large green arrows), leading to invasion of the neighboring compartment by the dividing cell. Once forces produced by cell division become weaker (small green arrows) than the forces produced by the actomyosin cable, the actomyosin cable would push back the dividing cell into its compartment of origin. b Schematization of the interplay between forces generated by the actomyosin cable (red) and the forces produced by cortex stiffening in dividing boundary cells (green)