Extracellular signal peptide that regulates cell fate. Represses root apical meristem maintenance. Mostly expressed in seedlings, roots, flowers, stems and apex, and, to a lower extent, in leaves and siliques. The O-glycosylation (arabinosylation) of the hydroxyproline Pro-113 enhances binding affinity of the CLE12p peptide for its receptor. Belongs to the CLV3/ESR signal peptide family. Truncated N-terminus.