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Nature 423, 999-1002 (26 June 2003) | doi:10.1038/nature01716;

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Enhanced gravi- and phototropism in plant mdr mutants mislocalizing the auxin efflux protein PIN1

Many aspects of plant growth and development are dependent on the flow of the hormone auxin down the plant from the growing shoot tip where it is synthesized. The direction of auxin transport in stems is believed to result from the basal localization within cells of the PIN1 membrane protein, which controls the efflux of the auxin anion.

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