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Aux/IAA PB1 domain dimerization is insufficient for ARF repression in Arabidopsis. (A) Models representing stabilized iaa16-1 with a single-interaction interface. (B) Histograms and (C) representative photographs of rosette diameters from wild-type plants overexpressing IAA16 (gray; n = 117), iaa16-1 (black; n = 47), iaa16-1K122A (blue; n = 117), or iaa16-1opca (red; n = 80) reveal that mutation of the PB1 invariant lysine or OPCA motif abrogates iaa16-1 low-auxin phenotypes.
