Extracellular signal peptide that regulates cell fate. Mostly expressed in roots, and, to a lower extent, in seedlings, stems, apex, flowers and siliques. The O-glycosylation (arabinosylation) of the hydroxyproline Pro-76 enhances binding affinity of the CLE5p peptide for its receptor. Belongs to the CLV3/ESR signal peptide family. Extended N-terminus.