Fig. 5.

Selected times showing the results of two simulations in which the surface cell layer originated from a uniform or b not uniform apical initials, assuming cell divisions with the SAD rule in mode I in both. Times t₂ and t₅ (side view) like in Fig. 4, t₉ (top view) shows a further developmental stage that was not considered earlier. In the cell pattern there are marked: the apical initials (yellow), the boundaries between the sectors (blue) and the cellular clone initiated at t₂ by the initial sister (gray). At t₉, the cell divisions are indicated in the apical initials (the light yellow cell packet formed by the two final self-renewing cells) and other cells (green) during the following 20 time-steps at the end of the simulation. The diagrams shows the angular distribution of all of the division walls (top view, where 0° and 90°, respectively, represent meridional and latitudinal orientations)