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Fig. 7. Mutants homozygous for both cap1-1/cap1-2 and scar2-1 show an enhancement of the distorted phenotype greater than either single mutant (A), with increased bulging and twisting of branches and inter-branch zones (ii). Mutants homozygous for both cap1-1/cap1-2 and arp2-1 have root hairs that do not progress beyond bulges on the surface of trichoblasts (B), unlike the cap1 single mutants, which initiate tip growth. Root hairs of an arp2-1 homozygote at the same magnification are shown as a control. Bars, 200 µm.