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, the DV (b) axes. MyoII is visualized by using a MyoII-mCherry construct. d Maximum recoil speed after ablations in the n individual control (only mCD8GFP expressing) and Cdc42DN-expressing egg chambers. Data are presented as mean values +/? SEM. For the control DV vs. AP comparison: p = 0.0043; for the Cdc42DN DV vs. AP comparison: p = 0.1157; both by two-sided Mann-Whitney test. e Egg chamber morphology under the indicated genetic backgrounds at S10 and S14. Armadillo staining in red and DAPI staining in blue. f Anterior-posterior (AP) to dorsal-ventral (DV) length ratio in the n individual egg chambers under the indicated genetic backgrounds at S10 and S14. Boxes extend from the 25th to 75th percentiles, the mid line represents the median and the whiskers indicate the maximum and the minimum values. For all comparisons, p < 0.0001 by two-sided Mann-Whitney test. g Time-lapse images showing the region of contact of one mCD8GFP expressing cell with a wild-type cell before and after nano-ablating (indicated by the dashed line) stress fibers juxtaposed to filopodia (white arrowhead). Circles indicate the initial positions of the filopodia tips juxtaposed to severed (white) or preserved (yellow) stress fibers. Arrow heads indicate the current position of the filopodia. h Percentage of filopodia undergoing either no displacement, recoil or extension during the first minute after ablation. i Time-lapse series of a representative egg chamber, before and after ablation (indicated by the dashed line) of the actomyosin network along the AP axis and across a filopodium. The arrowhead indicates the current position of the filopodium tip. Arrows indicate the actomyosin recoil directions. j Schematic representation of follicle cells and the subcellular distribution of stress fibers and intercellular filopodia forming a supracellular contractile network, Cdc42 controls DV-polarized supracellular tension and AP-directed global tissue elongation. a-c Time-lapse series of a representative egg chamber not expressing (a, b) and expressing (c) the Cdc42DN transgene marked by mCD8GFP coexpression before and after ablation
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