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Theoretical description of collective cell movement in the zebrafish tailbud. (A) Two-dimensional Voronoi tessellation represents cell shape. The green dots indicate cell centers. (B) Contact length lij (red) and intercellular distance rij (orange) between cells i and j. (C) Repulsive force F is a function of the distance rij between cells i and j, see Eq. 2. (D) Polarity ni aligns toward instantaneous velocity vi, see Eq. 3. To see this figure in color, go online.
