Probable transcription regulator that acts as a developmental regulator by promoting cell growth in response to light (By similarity). Required for the maintenance of the shoot apical meristem and for the formation of lateral organs. Promotes petal formation and growth, but may suppress organ differentiation in the boundary region. Expressed around apical meristems, at the boundaries of vegetative and reproductive organs. Induced by NAC054/CUC1 and NAC098/CUC2 in shoot organ boundary cells. Accumulates at the boundaries between the apical meristems and lateral organs in embryos, seedlings, and mature plants, and at the root apical meristem and in distinct cell files surrounding this area. First observed in heart-stage embryos, in the cotyledon boundary region of the shoot apex, and in the quiescent center and columella initial cells at the root tip. In bending-cotyledon stage embryos, weakly expressed in the boundary cells between the shoot apical meristem (SAM) and the cotyledons. In seedlings, accumulates in cells between the SAM and the cotyledons. During the reproductive phase, restricted to the basal regions of the pedicels and floral organs. In the inflorescence shoot apex, expressed in the early flower primordia, but not in the SAM. Later present in the cryptic bract region, but not in the floral meristem. No phenotype, probably due to redundant function of paralogs. Belongs to the plant homeotic and developmental regulators ALOG protein family.