Signaling peptide involved in the regulation of lateral organs separation, including fruits and leaves (PubMed:26071531). Involved in the perception of and response to light stress via the control of sinapoyl-malate accumulation, a UV-B protecting compound (PubMed:26967827). Counteracted by the antibiotic cefotaxime during responses to light stress. Expressed in shoot apical meristems (SAM); mostly specific to the L1 layer in the center of the meristem but also detected in the L2 layer in organ primordia. Also observed in the vasculature of seedling roots. Observed in seedlings shoot apical meristem (SAM). Later present in the entire inflorescence meristem, and accumulates strongly in organ primordia. In flowers, expressed in the anthers and in the nectaries. Present in the paraclade junctions between the primary stem and axillary stems, especially at the base of the cauline leaf and the emerging axillary shoot. No visible phenotype.