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Plant organs are produced from meristems in a characteristic pattern. This pattern, referred to as phyllotaxis, is thought to be generated by local gradients of an information molecule, auxin [1–6]. Some studies propose a key role for the mechanical properties of the cell walls in the control of organ outgrowth [7–12]. A major cell-wall component is the linear α-1-4-linked D-GalAp pectic polysaccharide...
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