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The 1/2 and 4/5 boundaries align by directed cell contact shrinkage. (A,C) Schematics of the 0-minute (A) and 260-minute (C) timepoints in B. (B) Live recordings from an embryo expressing α-Catenin-GFP showing aligning denticle field cells along a 4/5 boundary. A boundary is brought into alignment by the conversion of two three-cell junctions to a four-cell junction and the elimination of the magenta contact highlighted in A.
