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| Description: (a) Polar and lateral auxin transport is controlled by the distribution of auxin efflux carriers located in the plasma membrane. When efflux carriers primarily occur at the basal ends of cells, auxin will flow downward. Auxin may flow laterally when auxin efflux carriers occur at the sides of cells. (b) In a whole plant, auxin primarily flows downward from shoot tips to root tips, where it then flows upward for a short distance.
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