Signaling peptide involved in the regulation of lateral organs separation. Confined to the vasculature of various organs, including seedling roots, leaves, cotyledons, sepals and petals. Accumulates also in root hair cells. In seedlings, observed at high levels in the vasculature of cotyledons, first true leaves, and hypocoty. In flowers, expressed in the vasculature of sepals, petals, and style. In the paraclade junctions between the primary stem and axillary stems, mainly detected in the vasculature of cauline leaves. No visible phenotype. Extended C-terminus.