Fig. 1.

Anatomical topology of the arabidopsis root. (A) The root apical meristem (RAM) and elongation zone (EZ) of a wt arabidopsis Col-0 seedling root 7 d after sowing; composite image from a cleared root preparation. (B) RAM of the root shown in (A). The numbers represent cell positions with respect to QC (zero position). The n position corresponds to the first cortex cell adjacent to an epidermal cell that started to form a root hair bulge. Scale bars = 100 μm.

Microphotograph was published in Ivanov V.B., Dubrovsky J.G. 2013. Longitudinal zonation pattern in plant roots: conflicts and solutions. 2013. Trends in Plant Science, 18:237–243. Reproduced with permission of Elsevier.