Extracellular signal peptide that regulates cell fate. Represses root apical meristem maintenance. Mostly expressed in apex, and, to a lower extent, in roots, leaves, flowers and siliques. The O-glycosylation (arabinosylation) of the hydroxyproline Pro-86 enhances binding affinity of the CLE27p peptide for its receptor. Belongs to the CLV3/ESR signal peptide family. Truncated N-terminus.