Transcription factor that is responsive of the nuclear import of SHOOT MERISTEMLESS (STM). May form heterodimeric complex with the TALE/KNOX protein STM. Interacts with OFP1, OFP2, OFP3, OFP4, OFP5 and OFP15. The SR/KY and BELL domains are responsive for the interaction between the TALE/BELL proteins and the TALE/KNOX proteins. Belongs to the TALE/BELL homeobox family.