Small polypeptide acting as a regulatory molecule which coordinates cellular responses required for differentiation, growth and development, probably by restricting polar cell proliferation in lateral organs (e.g. leaves) and coordinating socket cell recruitment and differentiation at trichome sites (PubMed:15125775, PubMed:20826883, Ref.6, PubMed:25701405). Regulates the positional cue and cell proliferation along the body axis (PubMed:20826883). Mostly expressed in stems, flower buds, flowers and seedling shoots, to a lesser extent, in roots and young cauline leaves, but not in mature rosette leaves (PubMed:15125775). Barely observed in cotyledons and leaf primordia (PubMed:15125775). Expressed in the shoot apex and young developing leaves (PubMed:15125775). In seedlings, present in the shoot apical meristem and throughout the lamina of young leaves primordia (PubMed:15125775). In cotyledons, stems and mature leaves, restricted to the vasculature (PubMed:15125775). Weakly expressed floral meristem primordia (PubMed:15125775). During flower development, first observed in the center of the floral meristem, in the L3 and underlying cells (PubMed:15125775). In floral buds, observed at low levels in the center of floral meristems and accumulates progressively in sepals, petals and in the center of developing stamens (PubMed:15125775). In mature flowers, confined to the vasculature of all floral organs (PubMed:15125775). Accumulates in seedlings within 6 days after a shift from dark to light. No visible phenotype. Belongs to the DVL/RTFL small polypeptides family.