Transcription factor that is involved in the preservation of the spiral phyllotactic arrangement leading to a regular pattern of organ initiation. Required for maintenance of stem cell fate in the shoot apical meristem, and is essential for specifying floral primordia and establishing early internode patterning events during inflorescence development. Acts as transcription repressor of AG expression in floral and inflorescence meristems. Is also responsive of the nuclear import of SHOOT MERISTEMLESS (STM). In the fruit, plays a central role in patterning by negatively regulating SHP expression in order to prevent replum cells from adopting a valve margin cell fate. May form heterodimeric complex with the TALE/KNOX proteins STM, KNAT1/BP and KNAT6 (PubMed:12897247, PubMed:16513846, PubMed:16741748). Interacts with KNATM, isoform KNATM-B (PubMed:18398054). Predominantly expressed in stems, inflorescences and flowers. Expressed during late heart stage embryo in the SAM region between the two developing cotyledons. Expression is initially down-regulated in incipient floral primordia but a strong expression is subsequently detected in the central region of young floral primordia and the inner whorl of developing flowers. In fruit, is expressed in the replum of developing ovaries. 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.