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Schematic representation of the structural similarities in the organization of stem cell niches (SCMs) in plants and animals. (A) Drosophila melanogaster ovary, and (B) root apical meristem (RAM) of Arabidopsis thaliana. In both cases, organizer cells (orange) are surrounded by pluripotent stem cells (blue) that divide rapidly and that, after a determined number of divisions, elongate, and acquire a particular cell fate.
