Fig. 1. Structure of Arabidopsis roots. Drawings of a transverse section showing the cellular organization (A), and root meristems of wild type (B), caprice (cpc) mutant (C), and gl2, ttg, wer and 35S::CPC mutants (D). (A) The wild-type root is made up of five tissues, outermost is the epidermis, then inside that is cortex, endodermis, pericycle and vascular tissue. Epidermal cells are of two types: hair cells and hairless cells. The stele includes pericycle and vascular tissue. A few hairs are formed randomly in the cpc mutant (C), whereas hairs are formed in all of the epidermal cells in the gl2, ttg and wer mutants, and in the 35S::CPC transgenic plant (D).

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