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 (By similarity). Interacts with CRL1. Expressed in roots, culms, leaves and young panicles. By auxin under light or dark conditions and gravitropic stimulation of coleptile. Interactions between auxin response factors (ARFs) and Aux/IAA proteins occur through their C-terminal dimerization domains III and IV. May be due to competing acceptor splice site. Belongs to the ARF family.