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Basal relaxation. Basal relaxation is observed as a stage preceding apical constriction in some contexts. Active disassembly of F-actin at the basal end of the cells facilitates wedging of these cells as well as later apical accumulation of actomyosin cables, which subsequently deform the epithelium. Solid red lines, F-actin; dotted red curve, disassembled actin filaments on the basal side of cells; blue, basal lamina; purple, nucleus.
