Extended Data Fig. 8: EMSAs show that the binding of PtrWOX13a to the CAATCAC motif in the promoter of PtrWOX4a is specific.

The empty vector (PET101-His) was used as a negative control. The homeodomain transcription factor PtrZFD1 (Potri.002G035200) did not bind to the CAATCAC motif at a gradient of protein concentrations, which further confirmed the binding specificity of PtrWOX13a. The experiments in a and b were repeated independently three times with similar results.