Cindr is required to stabilize cells during patterning. (A and B) Progressive views of single ommatidia from Video 3 ; α-catenin–GFP marks AJs. (A–A‴) A fluctuating 1°–1° interface is highlighted in pink. (B–B″) Selected cells are pseudo-colored; arrows indicate the direction of membrane protrusion as a pre-1°cell is displaced. (C–F) Small clones of cells expressing cindr-IR²⁺³ (labeled with GFP). DE-Cad is shown in red. Broken lines outline mutant 1° cells. (G) Cartoons illustrating the expected phenotypic outcomes if one or both 1° cells are mutant for cindr. Bars, 5 μm.