Fig. 5. Frequency and spatial distribution of cell cycle length. (A-C) Reconstructed views of the L1 layer of the same plant, expressing 35S::YFP29-1, over a period of time. (D) Frequency distribution of cell cycle length among cells in the L1 and in the L2 and corpus together. Each of the color-coded bars represents a window of cell cycle length and each one of them is separated by 6 hours. Such individual events are mapped onto the L1 layer of the SAM in A-C, by marking both of the siblings. In cases where a single dot can be seen, the cells divided in the subsequent time interval. The color code employed in the spatial representations is the same as that used in representing the frequency distribution. The stages in A represent the ones at the beginning of the experiment. The stages marked in B and C are the ones in transition from P2 to P3 and P3 to P4, respectively. Elapsed time is indicated on each panel. White arrows point to cells in primordial regions P0, P-1 and P-2. White arrowheads point to cells in the intervening region located between P-1 and P-2. Yellow arrows point to cells in the intervening region, located between P0 and P-1. The cells marked in regions P-1 and P-2 (A, white arrows) are also represented in the next panel (B, white arrows) to maintain continuity.