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Anisotropic and isotropic growth forms in the plant A. thaliana. (Scale bar, 100 μm.) (A) The “normal” shape of the stem of A. thaliana grown on an NPA-treated substrate before oryzalin treatment. (B) Shape of an apex 72 h after treatment with oryzalin. The isotropic growth of the tip gives rise to a spherical meristem (from ref. 15)
