Auxin (indole-3-acetic acid) has its name derived from the Greek word auxein, meaning 'to increase', and it drives plant growth and development. Auxin is a small molecule derived from the amino acid tryptophan and has both hormone- and morphogen-like properties. Although there is much still to be learned, recent progress has started to unveil how auxin is transported from cell-to-cell in a polar manner. Two recent breakthrough papers from Gerd Jürgens' group indicate that auxin transport is mediated by regulated vesicle trafficking, thus encompassing neurotransmitter-like features.
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