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schematic of non-cell autonomous effects of actomyosin contractility. A&A’, strong medial actomyosin contractility in a subset of cells results in apical constriction across a group of cells. B, strong junctional actomyosin contractility in neighboring cells inhibits apical constriction in a central cell. C, weak junctional actomyosin contractility in neighboring cells permits apical constriction in a central cell.
