Fig. 7

Summary of process underlying cellular and plastid or chloroplast differentiation. Summary of elementary biological processes involved in cell (top) and plastid/chloroplast biogenesis (middle), shown on scales representing the physical position along the leaf, the calculated cell age and the sampling strategy employed by this study. Bar thickness approximately represents the measured magnitude of the process or the average expression level of the participating genes. The bottom panel represents the region of predicted action of the known candidate transcriptional regulators (with one negative regulator distinguished by a gray box), and highlights their absence at the initial stage