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Simulations with axial variation in cell-wall properties. (a) Elongation rate 
as a function of the distance 
from the organ tip. (b) Initial artificial geometry (as in figure 4). The organ is anchored (
, 
) at its right-hand end, and the tip of the organ (
, 
) is at the left. (c) Simulation at 
. (d) Simulation with cell division (within the pink region of (a)). Colour bars indicate cell areas (
). Scale bar, 
.
