Fig. 4.

Snapshots of epithelial folding simulated for three orientations of the cell division axis: a longest axis of each cell, b uniaxial direction (x-axis), and c radial axis ($k^{\mathrm{r}}=1.0\times {10}^{-3}$). All snapshots show simulation results at time $t=0.5{\tau }_{\mathrm{cc}}$