THO2 is a core component of the THO/TREX complex. It is essential for microRNA (miRNA) biogenesis, mRNA export, and siRNA-mediated gene silencing in the nucleus.
BEH1 is BZR1/BES1 family protein. It together with BEH2 plays an important role in the functional interaction between BZR1/BES1 family transcription factors.