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causes indoleacetic acid (IAA) accumulation in the root apical meristem, while simultaneously decreasing IAA in radical tissue required for lateral root growth.

Numerous mutants associated with auxin indicated an effect on lateral root development:

* alf4, which blocks the initiation of lateral root emergence.
* alf3, which inhibits the development of plant organs shortly after later root emergence.

The results from these mutants indicate that IAA is required for lateral

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