Auxin minimum triggers the developmental switch from cell division to cell differentiation in the Arabidopsis root
In multicellular organisms, a stringent control of the transitionbetween cell division and differentiation is crucial for correcttissue and organ development. In theArabidopsisroot, the bound-ary between dividing and differentiating cells is positioned by theantagonistic interaction of the hormones auxin and cytokinin. Cy-tokinin affects polar auxin transport, but how this impacts thepositional information required to establish this tissue boundary,is still unknown.