Transcription activator (By similarity). Positively regulates axillary meristems (AMs) formation and development, especially during inflorescence. Ubiquitous. Accumulates in an adaxial ball-shaped set of cells in three to five cell layers around the L3 layer of the shoot apical meristem (SAM) in youg plantlets. In the inflorescence meristem, confined to the axils of flower primordia.