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Speculative model for the action of the HD-ZIPIII/KAN growth-promoting module. HD-ZIPIIIs and KANs show polar expression in both the vasculature of the hypocotyl and the early leaf primordium. Activation of the HD-ZIPIII/KAN module causes the spatial induction/repression of a number of direct target genes that results in the production of auxin and outgrowth of the leaf primordium or elongation of the hypocotyl.
