Together with SHORTROOT (SHR, another GRAS transcription factor), SCARECROW controls the division of the endoderm/cortex initial cells and the differentiation of endoderm in Arabidopsis (Di Laurenzio et al. [1996]; Cui et al. [2007]).
SCR is required for the periclinal asymmetric division of the cortical/endodermal initial daughter cells and cell-autonomously required for QC identity [ 9, 14, 15].
The first signs pointing to the development of type VI trichomes is a first unequal division of the trichome initial, resulting in a small apical cell and the future stalk cell (Fig. 6b).
The pericycle cells are first observed, followed by the central metaxylem cell appearing just above the CCs after the first anticlinal division of the central metaxylem initial (Fig. 9a).
The endodermal cells then form cortical cells via several periclinal divisions of the endodermis initial (stage Cr4).
Two layers, the epidermis and endodermis, are then established in stage Cr3 by periclinal divisions of the epidermis endodermis initial.
Some PRE/TRE have been shown to maintain this transcriptional state throughout cellular divisions in absence of the initial activator or repressor [19], [20].
Atm seedlings showed an early ectopic division of the QC and initials before experiencing consumption of the meristem and massive cell swelling up to the very root tip.
The mean probability of symmetric division increased from the initial value of 0.5 to a final value of 0.99894 (mean, n = 49, SEM = 0.00003), and the mean percent of tumor-propagating cells evolved to 99.60% (mean, n = 49, SEM = 0.01%).
Therefore, * cannot be governed by formal rules, but rather, it can be introduced and eliminated only via EVFs of the form A&B→A*B (indicating that we obtain a compound from initially separate molecules) or A*B→C&D (indicating that we obtain two products from the division of an initial compound).
