Auxin response factors (ARFs) are transcriptional factors that bind specifically to the DNA sequence 5'-TGTCTC-3' found in the auxin-responsive promoter elements (AuxREs). Homodimers and heterodimers. Interactions between auxin response factors (ARFs) and Aux/IAA proteins occur through their C-terminal dimerization domains III and IV. Belongs to the ARF family.