DDF1 is a member of the DREB subfamily A-1 of ERF/AP2 transcription factor family (DDF1). The protein contains one AP2 domain. There are six members in this subfamily, including CBF1, CBF2, and CBF3.
BBM is an AP2-domain containing protein similar to ANT. It is expressed in embryos and lateral root primordium. PLT4 acts after PLT3,5 and 7 during lateral roof formation.